Steroid isolation , depending on context, is the isolation of chemical matter required for chemical structure elucidation, derivitzation or degradation chemistry, biological testing, and other research needs (generally milligrams to grams, but often more  or the isolation of "analytical quantities" of the substance of interest (where the focus is on identifying and quantifying the substance (for example, in biological tissue or fluid). The amount isolated depends on the analytical method, but is generally less than one microgram.  [ page needed ] The methods of isolation to achieve the two scales of product are distinct, but include extraction , precipitation, adsorption , chromatography , and crystallization . In both cases, the isolated substance is purified to chemical homogeneity; combined separation and analytical methods, such as LC-MS , are chosen to be "orthogonal"—achieving their separations based on distinct modes of interaction between substance and isolating matrix—to detect a single species in the pure sample. Structure determination refers to the methods to determine the chemical structure of an isolated pure steroid, using an evolving array of chemical and physical methods which have included NMR and small-molecule crystallography .  : 10–19 Methods of analysis overlap both of the above areas, emphasizing analytical methods to determining if a steroid is present in a mixture and determining its quantity. 
The StAR protein was first identified, characterized and named by Dr. Douglas Stocco at Texas Tech University Health Sciences Center in 1994.  The role of this protein in lipoid CAH was confirmed the following year in collaboration with Dr. Walter Miller at the University of California, San Francisco .  All of this work follows the initial observations of the appearance of this protein and its phosphorylated form coincident with factors that caused steroid production by Dr. Nanette Orme-Johnson while at Tufts University . 
It depends a lot on how strongly you brew your tea, as well as how caffeinated the tea itself is. In general, white tea has the least caffeine and the most EGCG (a potent anti-acne compound), green tea has a little more caffeine and a little less EGCG, and black tea has the most caffeine and not nearly as much EGCG. White tea is really your best bet. I’ve found a quite inexpensive box of white tea containing 100 tea bags (organic) for under $10 at Whole Foods – Prince of Peace brand, I believe. It takes a little getting used to, coming from black tea, but it’s really quite enjoyable. You should be fine with green tea, too, though I’d generally discourage drinking black tea since it can approach coffee-like amounts of caffeine.