Emily Green Rnd

Beginners Guide to Stem Cell Nutrition Emily Green Rnd

St?m cells h?v? th? r?m?rk?bl? ??t?nt??l t? d?v?l?? into many different cell t???? ?n the b?d? during early l?f? ?nd gr?wth. In ?dd?t??n, ?n m?n? t???u?? th?? ??rv? as a ??rt ?f ?nt?rn?l repair ???t?m, dividing ????nt??ll? without l?m?t t? replenish other ??ll? ?? long ?? th? person ?r animal is ?t?ll alive. Wh?n a ?t?m cell d?v?d??, each new cell h?? the potential ??th?r to remain a stem cell ?r become another t??? ?f ??ll w?th a more ★★★★★★l?z?d function, ?u?h ?? a mu??l? ??ll, a red bl??d ??ll, ?r a br??n ??ll. Stem cells ?r? distinguished fr?m other cell types by two important ?h?r??t?r??t???. First, they ?r? un★★★★★★l?z?d ??ll? ????bl? ?f r?n?w?ng themselves thr?ugh cell division, sometimes ?ft?r l?ng ??r??d? ?f ?n??t?v?t?. Second, under ??rt??n ?h????l?g?? ?r ?x??r?m?nt?l ??nd?t??n?, th?? can be ?ndu??d t? b???m? tissue- ?r organ-specific ??ll? w?th ★★★★★★l fun?t??n?. In ??m? ?rg?n?, ?u?h as the gut ?nd b?n? m?rr?w, ?t?m cells regularly divide to repair and replace w?rn ?ut or d?m?g?d t???u??. In ?th?r ?rg?n?, however, ?u?h as the pancreas ?nd th? h??rt, ?t?m ??ll? only d?v?d? und?r ★★★★★★l ??nd?t??n?. Until recently, scientists ?r?m?r?l? w?rk?d with tw? k?nd? ?f ?t?m cells from animals and hum?n? ?mbr??n?? ?t?m cells ?nd n?n-?mbr??n?? "??m?t??" or "?dult" stem ??ll?. Th? fun?t??n? ?nd characteristics of these cells w?ll be ?x?l??n?d in th?? d??um?nt. Scientists d????v?r?d w??? to derive ?mbr??n?? stem ??ll? fr?m ??rl? m?u?? ?mbr??? m?r? th?n 30 ???r? ?g?, in 1981. The d?t??l?d study of th? b??l?g? ?f mouse ?t?m ??ll? led to th? d????v?r?, ?n 1998, of a m?th?d t? d?r?v? ?t?m ??ll? fr?m hum?n ?mbr??? ?nd grow th? ??ll? ?n the l?b?r?t?r?. These ??ll? are ??ll?d human ?mbr??n?? stem cells. The embryos used ?n these ?tud??? w?r? created f?r r??r?du?t?v? ?ur????? thr?ugh ?n vitro fertilizationprocedures. When th?? were n? l?ng?r n??d?d f?r th?t ?ur????, they w?r? d?n?t?d f?r r????r?h w?th th? ?nf?rm?d consent of th? d?n?r. In 2006, r????r?h?r? made another br??kthr?ugh b? ?d?nt?f??ng conditions th?t w?uld allow some specialized ?dult ??ll? t? be "r??r?gr?mm?d" g?n?t???ll? t? ???um? a ?t?m ??ll-l?k? ?t?t?. Th?? n?w type of ?t?m cell, called ?ndu??d ?lur???t?nt ?t?m ??ll? (iPSCs), w?ll b? discussed ?n a l?t?r section ?f th?? document.