Gray Platelet Syndrome, also known as platelet alpha-granule deficiency, is related to bleeding disorder, platelet-type, 17 and myelofibrosis. An important gene associated with Gray Platelet Syndrome is NBEAL2 (Neurobeachin Like 2), and among its related pathways/superpathways are Response to elevated platelet cytosolic Ca2+ and Diseases of hemostasis. Affiliated tissues include bone marrow and bone, and related phenotypes are thrombocytopenia and abnormality of thrombocytes