. "The linkage of protein to heme P460 via heme P460-bis-L-cysteine-L-lysine." . . . . "protein-heme P460 linkage via heme P460-bis-L-cysteine-L-lysine" . "protein-haem P460 linkage via haem P460-bis-L-cysteine-L-lysine" . . . . . .