the identity of the precursor protein as a form of the purple membrane protein was established in different ways : ( 1 ) the cell proteins were labelled in vivo with 14c-proline during dark aerobic growth , the label was `` '' chased '' '' , and the cells transferred to the illuminated near-anaerobic conditions under which purple membrane is optimally synthesised ( induction conditions ) .
C0033665
precursor protein
C0033684
proteins