Mark asymmetric carbon atoms with a cross:
Polymethacrylic acid is a variant of plexiglas, Zingiberene is a spice contained in ginger, Luciferin produces light of fireflies, Adrenalin secreted by adrenal glands is a nervous system stimulant, it speeds up heart rate and increases blood pressure, Cholesterol is a cell wall component whose relationship with atherosclerosis seems certain, Puromycin is an antibiotic that blocks biosynthesis of proteins on ribosomes because its structure is similar to that of end of t-ARN chain, Methadone is a substituent of heroin used in detoxification of addicts .
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