14 yo male presents with autism, neutropenia and muscle weakness. CBC shows ANC:290/ul and very mild normocytic normochromic anemia (hb 13g/dl). The neutropenia has been noticed for over a year, and ANC has varied from 200/ul to 1000/ul. He has not had severe infection, but has occasional mouth sore. The peripheral blood smear and BM histologies are as follows.