Amelogenesis Imperfecta, Hypomaturation Type, Iia1, also known as amelogenesis imperfecta, pigmented hypomaturation type, 1, is related to amelogenesis imperfecta, type iiia and amelogenesis imperfecta type 2a1. An important gene associated with Amelogenesis Imperfecta, Hypomaturation Type, Iia1 is KLK4 (Kallikrein Related Peptidase 4). Affiliated tissues include breast and prostate, and related phenotypes are yellow-brown discoloration of the teeth and amelogenesis imperfecta