Animals that eat the vitamin K1 rich plants convert the K1 to K2 with their intestinal bacteria, as they are much more effective in this than humans. The K2 is then stored in their tissue, such as organs and fat, as well as in their milk. When the milk is then used to make butter, the color of the butter indicates the amount of beta-carotene and indirectly the amount of K2. The more yellow to orange the butter is ( sign of beta-carotene ), the more K2 is present. Although, when the animal is able to convert the beta-carotene to retinol, the butter made from their milk will be white, but it still contains significant amounts of K2. Likewise, when cows are given corn, their butter may also be more yellow, but can contain no K2, but only free range animal products will contain significant amounts of K2. Other animal sources such as their liver, pancreas, brain, kidney and dairy also contain good amounts of MK-4 ( form of vitamin K2 ), whereas fermented foods, such as natto and sauerkraut, are higher in MK-7 ( form of vitamin K2 ).
direction to printer to disregard correction made to text, 1755, from Latin stet "let it stand," third person singular present subjunctive of stare "to stand, stand upright, be stiff," from PIE root *sta- "to stand, set down, make or be firm," with derivatives meaning "place or thing that is standing" (cf. Sanskrit tisthati "stands;" Avestan histaiti "to stand;" Persian -stan "country," literally "where one stands;" Greek histemi "put, place, cause to stand; weigh," stasis "a standing still," statos "placed," stater "a weight, coin," stylos "pillar;" Latin sistere "stand still, stop, make stand, place, produce in court," status "manner, position, condition, attitude," stare "to stand," statio "station, post;" Lithuanian stojus "place myself," statau "place;" Old Church Slavonic staja "place myself," stanu "position," staru "old," literally "long-standing;" Gothic standan , Old English standan "to stand," stede "place," steall "place where cattle are kept;" Old Norse steði "anvil," stallr "pedestal for idols, altar;" German Stall "stable;" Old Irish sessam "the act of standing"). Also see related words under assist .
Biosynthesis of steroid hormones requires a battery of oxidative enzymes located in both mitochondria and endoplasmic reticulum. The rate-limiting step in this process is the transport of free cholesterol from the cytoplasm into mitochondria. Within mitochondria, cholesterol is converted to pregnenolone by an enzyme in the inner membrane called CYP11A1. Pregnenolone itself is not a hormone, but is the immediate precursor for the synthesis of all of the steroid hormones. The following table delineates the enzymes required to synthesize the major classes of steroid hormones.