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