>tr|A0A2S1NR20|A0A2S1NR20_9GENT Photosystem I iron-sulfur center OS=Asclepias humistrata GN=psaC MSHSVKIYDTCIGCTQCVRACPTDVLEMIPWDGCKAKQIASAPRTEDCVGCKRCESACPT DFLSVRVYLGAETTRSMGLAY