The article says, "Two of the most important of these processes are the adherence of substances to cell membranes and the withdrawal of proteins. Both of these are fundamental in biomedical research, since a substantial part of the process of designing new drugs is based on understanding how substances penetrate cell membranes to enter cells. "
___Some years ago in Scientic American I read an article about the structures in cells called 'micro tubules'. Contrary to the idea of protoplasm being some homogenous aqueous gell, at least 3 different kinds of micro tubules give the cell shape & support, as well as conducting chemicals to & from the memebrane & to & from internal structures.
___In spite of the fact this is relatively old news, I never see micro tubules mentioned in current discussions of cells. What gives?
