[Pilate wrote Iesu Nazoream, Rex Iudaeorum—"Jesus of Nazareth, King of the Jews."]  
[Pilate wrote Iesu Nazoream, Rex Iudaeorum—"Jesus of Nazareth, King of the Jews."]  11 This amino acid, isolated from casein in 1922, regulates the formation of ammonia by the liver, and some derivatives of it have been investigated as a treatment for [*] depression. Commonly added as an additive for soybean meal, this essential amino acid has the same codon as that for initiation of protein synthesis. For 10 points—name this sulfur-containing amino acid.
[Pilate wrote Iesu Nazoream, Rex Iudaeorum—"Jesus of Nazareth, King of the Jews."]  
Methionine [prompt on “M,” “SAM,” or “SAM-e”]