RSPH1Radial spoke head 1 homolog, also known as cancer/testis antigen 79 or testis-specific gene A2 protein, is a protein that in humans is encoded by the RSPH1 gene.FunctionThis protein is a part of axoneme, which forms the core of a cilium or flagellum.Clinical significanceMutations in RSPH1 are associated to Primary ciliary dyskinesia.