*Source: E Coli or Yeast or Baculovirus or Mammalian Cell; *Purity: >90%; *Tag Information: His tagged; *Notes: Repeated freezing and thawing is not recommended. Store working aliquots at 4 degree C for up to one week.; *Seq: MSTLEQTIGN TPLVKLQRMG PDNGSEVWLK LEGNNPAGSV KDRAALSMIV EAEKRGEIKP GDVLIEATSG NTGIALAMIA ALKGYRMKLL MPDNMSQERR AAMRAYGAEL ILVTKEQGME GARDLALEMA NRGEGKLLDQ FNNPDNPYAH YTTTGPEIWQ QTGGRITHFV SSMGTTGTIT GVSRFMREQS KPVTIVGLQP EEGSSIPGIR RWPTEYLPGI FNASLVDEVL DIHQRDAENT MRELAVREGI FCGVSSGGAV AGALRVAKAN PDAVVVAIIC DRGDRYLSTG VFGEEHFSQG AGI; *Accession#: NP_416916.1; NC_000913.3; P16703; *NCBI Summary: Cysteine synthase B is one of two isozymes in Escherichia coli that catalyze the formation of L-cysteine from O-acetyl-L-serine and sulfide . [More information is available at EcoCyc: EG10193].