selenocysteine


se·le·no·cys·teine

(sĕ-lē'nō-sis'tē-ēn), Cysteine containing selenium in place of one sulfur atom.

se·le·no·cys·te·ine

(sĕ-lē'nō-sis'tĕ-ēn) The biologically active form of selenium when attached to cysteine, an amino acid.