In order to explore the difference in immunophenotypic behavior between the indolent MCL and typical MCL, Espinet B, et al. measured the expression of CD38/CD200 by cytometry in non-nodal cases with cyclin D1–positive monoclonal asymptomatic lymphocytosis (MALD1) and typical MCL [44]. The gene discussed is CD200; the disease is mantle cell lymphoma.