KRTAP19-2 is a keratin-associated protein that functions in hair shaft structure and integrity. Based on limited published evidence, KRTAP19-2 is embedded within the hair cortex matrix where it cross-links with hair keratin intermediate filaments through extensive disulfide bonds involving cysteine residues 1. This cross-linking is essential for forming a rigid and resistant hair shaft. The protein exhibits cytosolic localization and demonstrates protein-binding capability. Genetic variation in KRTAP19-2 homologs, including non-synonymous polymorphisms, suggests functional importance in regulating fiber characteristics 1.