The transgene construct carries two loxP sites flanking a STOP cassette upstream of an LZK-T2A-tdTomato (tdT) fusion gene, uinder the control of a chicken actin promoter. Cre-mediated excision of STOP activates LZK-T2A-tdT, leading to overexpression of LZK and the associated fluorescent reporter tdTomato. (J:260350)