Harvard researcher Sriram Sankararaman, the lead author of the Nature study, said the place where Neanderthal DNA seemed to have the most influence in the modern human genome has to do with skin and hair.Akey said those instructions are as much as 70 percent Neanderthal.arvard researcher Sriram Sankararaman, the lead author of the Nature study, said the place where Neanderthal DNA seemed to have the most influence in the modern human genome has to do with skin and hair.
Print | Email article to a friend | Last updated: March 31, 2015. Prolactin is a hormone produced in the pituitary gland, named because of its role in lactation. It also has other wide ranging functions in the body from acting on the reproductive system to influencing behaviour and regulating the immune system.
During pregnancy prolactin levels increase. After the birth of a baby, a womanâs estrogen and progesterone levels drop and prolactin levels rise. These high levels of prolactin cause milk to âcome inâ or milk production to begin so a baby can be breast fed. In women who are not pregnant, prolactin is one of the hormones that regulate menstrual cycles. In males high levels of prolactin may be related to sperm production and sexual dysfunction.