The proton gradients that power respiration are as ... this is the single most counterintuitive idea in biology after Darwin's, and the only one to bear comparison with the concepts of Heisenberg ...

“Since a lot of development is guided by gradients and electric fields, we tried to create a hydrogel that had a gradient like you might see in the developing body that could guide stem cells to ...

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 ...