A First Class stamp <a href=" http://www.catenn.org/childrens-motrin-chewable-tablets-recall.pdf ">motrin infant drops dosage chart</a> “What’s important in biology is not that you have the right sequence to your DNA, but you have the right balance of DNA,” Lawrence said.  â€œWomen have two X chromosomes and men have one X and Y.  Since the Y chromosome lacks a lot of the genes in the X chromosomes, women have more expression of X chromosome genes than men – well that wouldn’t work biologically.  So nature had to devise a mechanism to equalize that.”