Distribution of ALDH3B1 in human lung, testis, and liver. IHC was performed using antibody against human ALDH3B1 on human lung (A), testis (C), and liver (E). In lung, ciliated cells of small bronchioles are immunoreactive (A, arrow). In testis, ciliated cells of efferent ductules are immunoreactive (C, arrow). Arrowhead in C indicates the transition from the low cuboidal cells of the rete to the tall columnar cells of the efferent ductule. In liver, zone 3 hepatocytes surrounding the central vein are immunoreactive (E, arrow). (B,D,F) Corresponding cells from negative controls in which IHC of human lung, testis, and liver was performed using antibody against human ALDH3B1 preadsorbed with peptide show no immunoreactivity (arrows). Bar = 50 μm.