For strain requests, please contact Mitch Singer. Requests are usually processed on Fridays and mailed out the following Monday or Tuesday. Please allow up to two weeks for strains to arrive. To aid in strain retrieval please include the appropriate strain name (ie, DK5208 rather than csgA in 1622) and the corresponding Box# and Slot#. Consult the following Excel file containing our current directory expanded from Dale Kaiser’s strain collection to find the necessary information.

Note: Mx446-Mx650, pDW21-pDW188, DK8600-8624 are no longer available through the Singer Lab. Please contact Daniel Wall ( if you are in need of the aforementioned strains.