In the early 1990s, Richard (Randy) Hardy and colleagues divided B cell precursors into subpopulations--the Hardy fractions--based on the cells' expression of various cell surface proteins. This classification helped lay the groundwork for our present-day understanding of the molecular events that control early B cell development.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2118322PMC
http://dx.doi.org/10.1084/jem.2036ftaDOI Listing

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