Im writting to let you know that we didnt get enough Tregs during the expansion to proceed The failure of expansion was unexpected as the donor we used was fine for our previous projects and we just c

Dear [Recipient],

I am writing to inform you that we have encountered an unexpected setback in our expansion process, resulting in a shortage of Tregs necessary to proceed with our project. Although the donor we previously used was suitable for our previous projects, the new lot we recently acquired did not meet our expectations.

In order to rectify this situation, we have obtained a new donor and initiated a fresh round of expansion yesterday. We apologize for any inconvenience caused by this delay and assure you that we are working diligently to expedite the process.

Additionally, we would like to inform you that the MDSC assay will be completed by next Wednesday. We will promptly update you with the results as soon as they become available.

Thank you for your understanding and patience in this matter. If you have any further questions or concerns, please do not hesitate to reach out to us.

Best regards,

[Your Name