Scott donated stock back, at generation 41, to repopulate the colony. The progeny of these are now termed BALB/cJ and, as of 14 December 2006, were 221 generations from the founding stock.
Scott returned stock at generation 41 to repopulate the colony. The offspring of these are now known as BALB/cJ, and as of December 14, 2006, they were 221 generations from the original stock.