abnormal double-negative T cell morphology increased T cell number increased double-negative T cell number MP:0005090 MPheno.ontology greater than expected numbers of the subset of T cells found in the thymus that express neither CD4 nor CD8 increased CD4-CD8- T cell count increased double negative T cell number increased double-negative T cell count increased double-negative T cell numbers increased double-negative T-cell numbers increased numbers of CD4-CD8- T cells increased numbers of double-negative T cells