Krt5-expressing basal cell of bladder urothelium true K5-basal cell of bladder urothelium EMAPA:36074 Krt5-expressing basal cell of bladder urothelium (syn: K5-basal cells of bladder urothelium) (TS:23-TS:28): cells expressing Krt5, present in the basal and intermediate cell layers of the bladder urothelium. First detected between E14-E15, at TS:23. They express Krt5, Trp63 and Shh (do not express Isl1, Foxa2 or uroplakins). From TS:27 (P0), a subpopulation of these cells also express Krt14. In the adult, they make up ~90% of the urothelium of bladder. anatomical_structure