PCDH20 (Protocadherin 20): PCDH20 is a member of the protocadherin family, a group of proteins involved in cell-to-cell adhesion and signalling, particularly within the nervous system. PCDH20 plays a vital role in neural development and connectivity, supporting the formation and maintenance of neural networks. Dysfunctions in PCDH20 have been associated with neurodevelopmental disorders and may affect cognitive and sensory functions.