Endocrine Abstracts

After its first description in 1924, and naming by Evelyn Howard in 1939 to reflect its transient and unknown function, the X-zone of the mouse adrenal attracted a great deal of attention from endocrinologists. What factors were responsible for its appearance at the age of 8–12 days, growth, and then disappearance with puberty in the male and first pregnancy in the female? A great deal was discovered, even given the limited techniques available, about which hormones contr...