KRT19 and benign prostatic hyperplasia: Detection of calponin as a marker for smooth muscle cells, keratin-19 as a marker for glandular epithelial cells, tyrosine hydroxylase as a marker for catecholaminergic nerves, and PSA as a marker for degree of BPH suggested variations in expression levels of markers, reflecting variations in tissue composition and divergent degree of BPH between samples from different patients (Fig. 7b).