The RMCE cassette of the TI{CRIMIC.TG4.1}CCT1CR60256-TG4.1 insertion has been replaced with a TI{FFL.1} cassette that is in gene-trap (GT) orientation relative to CCT1. This is expected to truncate the CCT1 protein and to result in the expression of a separate mCherry protein under the control of endogenous CCT1 regulatory sequences.