http://www.vitaletherapeutics.org/vtlhmgmo.htm
This diagram illustrates how the monooxygenase receptor for vitalethine, vitaletheine (VSH) and its sulfenic acid (VSOH), and vitalethine (VSSV) which cycles through the other two, can regulate cholesterol production and cancer gene activation. Cancer cells need about 25% more cholesterol every time they divide. The monooxygenase depends upon a steady supply of oxygen, nearly all of the B vitamins, and functions better with vitamin E, than with excessive vitamin C. This enzyme is increased by progesterone (one of the safer natural hormones), and probably by dimethylglycine (a building block for the pangamic acid once known as vitamin B15) and even by 5-HTP and our sleep hormone, melatonin.