Long Day Breeders Portable Link

The Syrian hamster remains a cornerstone model for:

While the specific timing varies by latitude and species, the classic examples of long day breeders are found across the animal kingdom:

The melatonin signal acts on high-affinity MT1 receptors in the of the anterior pituitary. In LDBs, a short melatonin signal (long days) triggers the PT to increase expression of thyrotropin (TSH) . Locally produced TSH acts on TSH receptors in the hypothalamus, specifically on tanycytes lining the third ventricle.