Sll0408 is a complex immunophilin from cyanobacteria. The protein shows high homology to lumen-located complex immunophilins, AtCYP37and AtCYP38 (antibody product No.: I01A-1/2 and I02A-1/2) from higher plants. The function of Sll0408 immunophilin is not known although it was suggested that it may be involved in the biogenesis of the photosystem II, especially under stressacclimation.