Mitochondrial Complex V Deficiency, Nuclear Type 4b, also known as mc5dn4b, is related to mitochondrial complex iv deficiency, nuclear type 5 and mitochondrial complex v deficiency, nuclear type 5, and has symptoms including apnea An important gene associated with Mitochondrial Complex V Deficiency, Nuclear Type 4b is ATP5F1A (ATP Synthase F1 Subunit Alpha). Affiliated tissues include pons and cerebellum, and related phenotypes are seizure and nystagmus