The function of Ensembl gene identifier ENSG00000111834 (RSPH4A, radial spoke head component 4A) is as follows. Component of the axonemal radial spoke head which plays an important role in ciliary motility (PubMed:19200523). Essential for triplet radial spokes (RS1, RS2 and RS3) head assembly in the motile cilia (By similarity). {ECO:0000250|UniProtKB:Q8BYM7, ECO:0000269|PubMed:19200523}.