M00020 Serine biosynthesis, glycerate-3P => serine
M00018 Threonine biosynthesis, aspartate => homoserine => threonine
M00621 Glycine cleavage system
M00555 Betaine biosynthesis, choline => betaine
M00974 Betaine metabolism, animals, betaine => glycine
M00975 Betaine degradation, bacteria, betaine => pyruvate
M00033 Ectoine biosynthesis, aspartate => ectoine
M00919 Ectoine degradation, ectoine => aspartate
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