FASN and infection: Interestingly, the few colonies recovered from the FASN∆/∆-PyMT soft agar culture preserved important residual FASN messenger RNA (mRNA) and protein levels (Fig. 1b), indicating the colony formation process occurred only in “escapers” (i.e., due to the <100% efficient adenovirus-expressing Cre-recombinase (adeno-Cre) infection process).