PSAK_THEEB psaK MVLATLPDTTWTPSVGLVVILCNLFAIALGRYAIQSRGKGPGLPIALPALFEGFGLPELLATTSFGHLLAAGVVSGLQYAGAL Photosystem I reaction center subunit PsaK Light-harvesting 8.0 kDa polypeptide tsr2273 Photosystem I subunit X 83