For each Addgene order, a Recipient Scientist Acknowledgement (RSA) must be signed by the recipient scientist. The Recipient Scientist is the person in the lab who will be using the materials and is listed on the MTA. The RSA must be completed by this person, and helps us make sure that the scientist has read and understands the terms of the MTA. Some institutions may require the Principal Investigator (PI) of the recipient's lab to complete the RSA. In those cases, we ask that the Recipient Scientist forward the RSA to their PI.