Positive Samples: HepG2, BT-474, MCF7 Immunogen sequence: MKENVASATV FTLLLFLNTC LLNGQLPPGK PEIFKCRSPN KETFTCWWRP GTDGGLPTNY SLTYHREGET LMHECPDYIT GGPNSCHFGK QYTSMWRTYI. Prolactin (PRL) is a pituitary hormone involved in the stimulation of milk production