Mukherjee's team is also known for defining and characterizing skeletal stem/progenitor cells (also called osteochondroreticular or OCR cells). In 2015, they prospectively identified these progenitor cells from bone, and showed, using lineage tracing, that these cells can give rise to bone, cartilage, and reticular cells (hence the term "OCR" cells). They established that these cells form a part of the adult skeleton in vertebrates, and that they maintain and repair the skeleton.[37]