ウェブ6 時間前 · BAs are steroid acids with a backbone of 24 carbon atoms, metabolized from cholesterol. In humans and rodents, a BA molecule usually features a C-24 carboxyl group, a C-5β hydrogen and a C-3α hydroxyl group, with additional hydroxylation possible at C-7, C-12 or C-6 (Fig. 2 A). A).