Sulfur is in the amino acids cysteine and methionine. Methionine is considered an essential amino acid because the body can not make it (doesn't mean different organisms couldn't make it).
Phosphorus is a major component of RNA, DNA, in cell membranes etc.
Nitrogen, carbon, oxygen and hydrogen are in every amino acid and, well, everywhere.
Last edited by ernie; 03-12-2013 at 01:57 PM.
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