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| PR:P9WP55 | O-acetylserine sulfhydrylase (Mycobacterium tuberculosis H37Rv) | | |  | | |
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| PR:P45040 | cysteine synthase (Haemophilus influenzae Rd KW20) | | |  | | |
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| PR:P0ABK5 | cysteine synthase A (Escherichia coli K-12) | | |  | | |
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| PR:000024345 | cysteine synthase A, initiator methionine removed form | | |  | | |
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| PR:Q43725 | cysteine synthase, mitochondrial (Arabidopsis thaliana) | | |  | | |
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| PR:Q43725-1 | cysteine synthase, mitochondrial isoform 1 (Arabidopsis thaliana) | | |  | | |