The GRCF offers custom & pre-designed siRNAs, shRNAs, miRNA mimics and other RNAi products 

Custom siRNA

Custom siRNAs can be used in cell culture experiments to silence genes. Horizon Discovery, IDT, MilliporeSigma and ThermoFisher all offer a variety of custom design options, modifications and purification possibilities. Each company has their own set of design tools that are available to you through our partnerships. Check out their websites for all of the details.

siRNA, shRNA & other RNAi products

Horizon Discovery, IDT, MilliporeSigma, Qiagen and ThermoFisher offer many predesigned siRNA, shRNA, miRNA mimics, miRNA libraries and individual assays. Check out their websites for their offerings. 

A few things to know

All orders are final.

Specialized quotes from must be handled outside of the portal through contact with the local sales representative and the GRCF. Please email us with the details of what you would like to order.

IDT ACCOUNt Creation

You can create an account on IDT’s website instantly, but you must use an username and password that is specific to the portal, even if you have been ordering from their standard web site. If you don’t, you will not receive the discounted pricing below, and you will be charged shipping. When placing your first order, you will see incorrect pricing and shipping charges, but your bill will be correct.  NGS items cannot be ordered through the portal, but can be ordered via quotes.

MilliporeSigma Account creation

To set up an account with MilliporeSigma, please  email us with the information listed below. Account set up takes about 24 hours.

  • Your name & email address
  • Your phone number
  • Your PI’s name & email address
  • Your JHU building and room number (for deliveries)

Horizon/Dharmacon Account Creation

Horizon/Dharmacon accounts can be created instantly. If you already have a Dharmacon direct account, you may use that account on the portal and do not need to set up a new account.  In order to ensure correct routing and delivery of your order, please list building and room number and your PI name and email address in the “Order Notes” field.

Qiagen Account Creation

Create an account on the Qiagen website.  Place all of your items in a shopping cart.  Proceed to check out, and use the “transfer cart” option to send the cart to  We will place the order for you.  Note: only items not available on the CoreStore website should be ordered using this method.

ThermoFisher Account Creation

You must link a account to our portal to place orders. To create a new account or link an existing account, download and follow  these instructions.


Johns Hopkins East Baltimore Medical Campus

600 N. Wolfe Street

Blalock Building, Room 1004

Baltimore, MD 21287 USA


Monday – Friday:

7:00 am to 4:30 pm

After-hours pickup is available from the lockers near the Blalock elevators. Please contact us to make arrangements.




my green lab Certified: Level “Green” 

Frequently asked questions

How do I set up a GRCF portal account with my favorite company? Is each company a different login?
  • For Dharmacon, if you have a current account, you do not need to create a new account. Simply starting on  our portal login page will associate your account with our portal. If you need to create an account, you can do so on the  registration pageOrders created on the Dharmacon portal create a quote which is emailed to the GRCF. The GRCF will place the orders by the end of the day. You will receive an email when the order has been placed.

  • For IDT, you must create a  portal specific account, but account set-up is instantaneous. Simply go to our portal and create a new account. Make sure you do not click anywhere else on the page prior to creating the account, or the web-site will lose the association with our portal. Once you have set up the account, you may place your order. When placing your first order on a newly created account, you will see incorrect pricing and shipping charges, but your bill will be correct.

  • For MilliporeSigma, you need to email us the following information:
  • Your name
  • Your email address
  • Your phone number
  • Your building and room number (for CoreStore deliveries)
  • Your PI’s name & email address
  • If you already have set up a GRCF account with MilliporeSigma, you may order using  this link.

  • Qiagen do not require an account. Shopping carts are emailed to the GRCF ( for ordering.

  • For ThermoFisher you must link your ThermoFisher account to the Dashboard.  Please download and follow these instructions.

How long does it take to activate my account?

Dharmacon and IDT are instantaneous. If you already have a Dharmacon direct account, you may simply login on our  portal page and your orders will be associated with the portal. If you already have a direct IDT account, you MUST create a new account by clicking “Set up new account” on our  portal page (without clicking anywhere else on the page.)

For MilliporeSigma, you must create an account and wait for an email indicating that the account is active. This may take up to two business days.

For ThermoFisher, you must link a account to our portal. This process may take 24 hours.

Qiagen does not require an account. Orders are emailed to us and placed by the GRCF staff.

I already have an account set up with this company on their standard web-site. May I use that account?

For IDT and MilliporeSigma, you must create an account specific to the GRCF portal in order to take advantage of our pricing. Existing ThermoFisher accounts may be used, once they are linked to the portal. Prior Horizon Discovery (Dharmacon) accounts work, as long as you start on our  portal page.

Do I need a purchase order to place an order? Can I pay with an IO number?

On any of these sites, you will pay with your budget number. You do not need a credit card or a PO number from SAP. KKI customers should enter the last name of the PI on their grant or a KKI PO number. All customers (KKI and JHU) will be billed through iLab. JHU customers should check to make sure their budget numbers are active in iLab. Non-sponsored budget numbers must be added to iLab manually by following  these instructions.

When will I receive my items?

Standard oligo orders placed before noon from MilliporeSigma arrive the next business day. Standard oligo orders placed with IDT before 2 PM or ThermoFisher before 5 PM, will arrive in our office two business days after they are placed. Other items vary depending on the time it takes the manufacturer to ship. All items are available in Blalock 1004 the day they are received and will go out for delivery with the CoreStore the next morning.

Will you leave the order in my lab if no one is there?

No. Due to the sensitive nature of some of the items ordered through our portals, someone must be present in your lab for your order to be delivered.

May I pick up my order, even if I indicated I wanted delivery when I placed the order?

Yes. On a typical day, we receive the orders by 11:30 AM. Orders are available in Blalock 1004 from the time they arrive until we close at 4:30 PM. You may stop by and pick them up anytime during those orders. If you call ahead, please be prepared to tell us the order number and then name of the person placing the order. Orders are brought to the CoreStore early the following morning and set out for delivery.

If you know that you would like to pick up your order at the time you place your order, you may replace your building and room number with the words “Pick up” and we will contact you when the order arrives.  Pickup orders are placed in one of our lockers near the Blalock elevators and are available 24/7.

I order for more than one lab. How do I change where an order is being delivered?

You should create a separate ordering account for each lab to make sure that your orders are delivered to the correct location.

Why do I see shipping charges when placing an order from IDT?

This usually means that you have logged into the portal using a username and password that were set up for the SAP punchout or the normal IDT web-site. Using the wrong login will take you to the direct website without any notification. You will only receive free shipping if you use a username and password set up specifically on our portal. You will know you are on the correct website if you see a banner that says “You are using the DNA Analysis Facility Portal” on every page. Also, when you begin the checkout process, the billing and shipping information should be prepopulated with the GRCF address and PO. Click past this page and you will come to a page that asks for your budget number and building and room number. 

How do I order NGS products from IDT?

All NGS products, including o-pools, must be ordered via custom quote. Please send your quote request to Roxann Ashworth, and she will work with IDT to create your quote and place your order. This will allow you to receive a small discount and free shipping.