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September 2001 in “Journal of Biological Chemistry” The study cataloged human type II hair keratins, identifying six members divided into two groups: group A (hHb1, hHb3, hHb6) and group C (hHb2, hHb4, hHb5). Using specific antisera, a two-dimensional catalog was established, revealing isoelectric variants and their roles in hair differentiation. hHb5 and hHb2 were linked to early hair differentiation stages, while hHb1, hHb3, and hHb6 were expressed in advanced stages. hHb4 was found in the tongue, not hair follicles. The study suggested random keratin-pairing during differentiation and integrated type II keratins with type I and epithelial keratins into a comprehensive human keratin catalog.