The following is in response to a query from Dr. Lucy Cherbas on the identity of the cultured cell lines used in Bownlee et al. 2011 JCB 195:231 Buster et al. 2011 2013 JCB 201:49 Wallace et al. 2015 G3 5:803 In papers from my lab, the S2R+ and Kc cells that we used came from the DGRC. However, S2 cells that we used in our papers came from two sources, DGRC and Invitrogen. I couldn't say that we used only S2 cells from Invitrogen in any individual study. The references have been placed under S2-unspecified.