>tr|A0A2S1NXK2|A0A2S1NXK2_9GENT Photosystem I iron-sulfur center OS=Asclepias quadrifolia GN=psaC MSHSVKIYDTCIGCTQCVRACPTDVLEMIPWDGCKAKQIASAPRTEDCVGCKRCESACPT DFLSVRVYLGAETTRSMGLAY