title: Anterior and posterior groups of portal vessels in the avian pituitary.
mesh_terms: D000818:Animals; D001717:Birds / Q000033:anatomy & histology*; D002454:Cell Differentiation; D007030:Hypothalamo-Hypophyseal System / Q000098:blood supply*; D010902:Pituitary Gland / Q000098:blood supply* / Q000166:cytology; D010906:Pituitary Hormone-Releasing Hormones / Q000097:blood; D013045:Species Specificity
chemical_list: D010906:Pituitary Hormone-Releasing Hormones