Abstract
Summary
A study has been made of agar colony forming capacity of marrow during regeneration after localized depletion. From the second week of regeneration agar colonies (in vitro CFU) of marrow are readily observed. In vitro CFU then increase linearly with hemic cellularity with a slope of about one. If the in vitro CFU represents a granulocyte precursor, the data suggest that recovery of these cells requires a sustained influx from ancestral cells.
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