Given the task definition and input, reply with output. In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.

 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 .

- B