Nh3

OOC—C—CH2 —CH3 + HS—CH2 —CH—COO" O

a -Ketobutyrate

Cysteine

FIGURE 22-14 Biosynthesis of cysteine from homocysteine and serine in mammals. The homocysteine is formed from methionine, as described in the text.

Three Nonessential and Six Essential Amino Acids Are Synthesized from Oxaloacetate and Pyruvate

Oxaloacetate

Asparagine

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