Task: Named Entity Recognition
Input (English):  The clonality of mature peripheral blood - derived myeloid and lymphoid cells and bone marrow haemopoietic progenitors from 18 females with myelodysplasia ( MDS ) ( five refractory anaemia , RA ; one RA with ringed sideroblasts , RARS ; three chronic myelomonocytic leukaemia , CMML ; four RA with excess of blasts , RAEB ; five RAEB in transformation , RAEB - t ) was studied by X - chromosome inactivation analysis .
Output (English): X - chromosome