The human type I hair keratin subfamily comprises nine individual members, which can be subdivided into three groups. Group A (hHa1, hHa3-I, hHa3-II, hHa4) and B (hHa7, hHa8) each contains structurally related hair keratins, whereas group C members hHa2,
Urocortin, rat TFA is a neuropeptide and a potent endogenous CRFR agonist (Kis: 0.97 nM, 1.5 nM, and 13 nM for mouse CRF2β, rat CRF2α, and human CRF1).