Development of the endocrine system alpha cells. The insulin concentration within the fetal pancreas is 3.6 pmol/g at seven to ten weeks, which rises to 30 pmol/g at 16–25 weeks of gestation. Near term, the insulin concentration increases to 93 pmol/g. The endocrine cells have dispersed throughout the body within 10 weeks. At 31 weeks of development, the islets of Langerhans have differentiated. While the fetal pancreas has functional beta cells by 14 to 24 weeks of gestation, the amount of insulin that is released into the bloodstream is relatively low. In a study of pregnant women carrying fetuses in the mid-gestation and near term
Ryan Langerhans between the Double-A Greenville Braves and the Triple-A Richmond Braves. Langerhans was called up by the Braves in September. On September 5, in his second game of the season, Langerhans got his first major league hit coming against the Pittsburgh Pirates. Despite making his major league debut in 2002, Langerhans did not become an everyday big-league player until 2005, getting playing time for the Braves in all three outfield positions. He is part of the group of 18 rookie players nicknamed the "Baby Braves" that Atlanta called up from its minor league system during the 2005 season. Langerhans started 2006