MYSM1 and Thrombocytosis: Among the anomalies of Mysm1−/− mice, especially defects in the bone marrow (BM) – resulting in lymphopenia, anemia, and thrombocytosis – and in lymphocytes have been described.31, 32 However, no conclusive data are available so far on the function of Mysm1 in the thymus or in other tissues.