the sulfur requirements of tobacco ( nicotiana tabacum l. var . xanthi ) xd cells grown in chemically defined liquid media can be satisfied by sulfate , thiosulfate , l-cyst ( e ) ine , l-methionine or glutathione , and somewhat less effectively by d-cyst ( e ) ine , d-methionine or dl-homocyst ( e ) ine .
C0038720
sulfate
C0039950
thiosulfate