A method is provided for treating a recipient with a biological product obtained from at least one donor that may be the same as, or different from, the recipient. The method includes identifying a targeted level of gene expression of a first gene in a biological product to be transferred from at least one donor to a recipient； treating the at least one donor to achieve the targeted level of gene expression of the first gene in the biological product； and transferring the biological product from the at least one donor to the recipient.
