The JAK-STAT signaling pathway transmits information from chemical signals outside the cell, through the cell membrane, and into gene promoters on the DNA in the cell nucleus, which causes DNA transcription and activity in the cell. The JAK-STAT system is a major signaling alternative to the second messenger system. The JAK-STAT system consists of three main components: a receptor, JAK and STAT.^[1]

JAK is short for Janus Kinase, and STAT is short for Signal Transducer and Activator of Transcription.^[1

21 那一種荷爾蒙經由JAK-STAT 訊號途徑產生作用？

性釋素（GnRH） 促濾泡素（FSH） 泌乳素（prolactin） 動情素（estrogen）

ans PROLACTIN