Sara V R, Lazarus L, Stuart M C, King T
Science. 1974 Nov 1;186(4162):446-7. doi: 10.1126/science.186.4162.446.
Growth hormone was administered to pregnant rats maintained under dietary control, and fetal and placental growth and nutrition were examined. Growth hormone had a selective action on brain growth that could not be attributed to nutrient mobilization but suggested a trophic factor which is unique to the brain.