FIG. 1.

Counts of CD34⁺ cells in Matrigel plugs. Plugs were digested with dispase, stained with fluorochrome-tagged antibodies, and suspended in PBS. The total number of cells in each sample was calculated based on the volume of the cell suspension and the rate at which fluid was taken up in the flow cytometer. *, significantly different from cell number in unsupplemented Matrigel harvested at 18 h (day 1); a, significantly different from cell numbers in unsupplemented Matrigel samples harvested at 5 and 10 days. Cell counts in Matrigel-lactide at 5 versus 10 days postimplantation were also significantly different. Numbers are means ± SE (n = 5) for all groups.