ATP6AP2 and schwannoma: We next sequenced the entire coding region of ATP6AP1 and ATP6AP2 in 103 histologic mimics of GCTs, including paragangliomas (n = 29), schwannomas (n = 25), adrenocortical carcinomas (n = 16), oncocytomas (n = 13), hibernomas (n = 10), and chromophobe renal carcinomas (n = 10).