Task: Named Entity Recognition
Input (English):  The multilineage progenitor ( MLP ) assay enabled us to discriminate among seven types of hematopoietic progenitors , which are multipotent progenitor p - MTB ( capable of generating myeloid , T and B cells ) , bipotent progenitors p - MT , p - MB and p - TB , and unipotent progenitors p - M , p - T and p - B .
Output (English): - B