The RMCE cassette of the TI{CRIMIC.TG4.1}Acox1CR00998-TG4.1 insertion has been replaced with a TI{FFL.1} cassette that is in gene-trap (GT) orientation relative to Acox1. This is expected to truncate the Acox1 protein and to result in the expression of a separate mCherry protein under the control of endogenous Acox1 regulatory sequences.