Cyclic Neutropenia, also known as cyclic hematopoiesis, is related to pharyngitis and granulocytopenia. An important gene associated with Cyclic Neutropenia is ELANE (Elastase, Neutrophil Expressed), and among its related pathways/superpathways are Innate Immune System and ERK Signaling. Affiliated tissues include neutrophil and bone marrow, and related phenotypes are sinusitis and headache