This photograph is an example of DNA separated in a cesium chloride density gradient. Two tubes containing ... which has a white arrow pointing to it, is lower in the tube. The lower band contains ...

Thus, gene expression is vital to the effectiveness of the gradient in specifying different cell fates. The presence of a Dpp gradient in fruit fly wings has been demonstrated in living flies ...

Red arrows indicate the nuclear spin axes at the positions of the N3 nitrogen atoms on the guanine (G) bases. Due to the helical structure of DNA, there is an angular deviation in the orientation ...