There are two types of subroutine: Procedures perform a specific task but do not return a value. Functions manipulate ... have to worry about always using a different variable name.

However, the multiple cell types within a tissue don't just have different functions. They also have different transcriptional programs and may well divide at different rates. Proper regulation of ...

Your body uses magnesium for many critical functions. Learn which foods contain magnesium and how to get more of it.