We have recently isolated two genes encoding proteins which have either hom
ology or affinity to RBP-J, a transcription factor involved in Notch signal
ing. Kyo-T interacts with RBP-J and possibly regulates the function of RBP-
J. RBP-L has a highly homologous region with REP J but the function of RBP-
L is unknown. Fluorescence in situ hybridization analysis of human metaphas
e chromosomes localized Kyo-T and RBP-L to Xq26 and 20q12-13.1, respectivel
y.