The contents of proteins, carbohydrates, lipids and DNA during the embryogenesis of Drosophila.

The concentration of proteins, sugars, lipids and DNA has been determined during the embryogenesis of Drosophila. The protein content decreases after fertilization, being in the late embryo only 60% the value of the oocyte. The total sugar increases about 2.5-fold, from 3.5 h on until the end of embryogenesis. The lipids increase with a sharp peak at about 4 h and decrease during the rest of embryogenesis. DNA increases exponentially from the beginning of embryogenesis.