Representative patterns of circulating cell levels in four periodic hematological disorders considered in this review. (A) CN,54 (B) PV,55 (C) AA,56 and (D) periodic CML.57 The density scales are neutrophils, 10³ cells/μL; white blood cells, 10⁴cells/μL; platelets, 10⁵ cells/μL; reticulocytes, 10⁴ cells/μL; and Hb, g/dL.