Reviewer guidelines Register Reviewer Benefits Resources. Med 48, NMR 22,
Vitamin C is an essential nutrient that must be supplied through the diet because humans lack the enzyme, gulonolactone oxidase, and therefore cannot synthesize vitamin C de novo. Pharmacol 63, Nutr 69, Aubert G, P M Lansdorp. Organismal longevity may reflect the integration of the replicative histories of all of the cell populations of the organism.
Cytogenetic data from about angiosperm species showed heteromorphic sex chromosomes in approximately half, mostly taking the form of XY sex-determination systems. Ever since the discovery of X-inactivation through research into Calico cats, it has been postulated that X-inactivation plays a role in genetic sex determination in humans.
Trisomy 13 Patau Syndrome. There is a gene in the Y-chromosome that has regulatory sequences that control genes that code for maleness. The female has two X chromosomes, and all female egg cells normally carry a single X.
Biomarkers Prev. January8, Telomere length trajectory and its determinants in persons with coronary artery disease: Longitudinal findings from the Heart and Soul Study. Harman D. Nutr , Res 25,