Dissolved oxygen concentration measurements in cell-containing PFCE beads and cell-free PFTBA beads implanted in experimental mice (n=8 on day 1, n=9 on all other days), in cell-free PFCE and PFTBA beads implanted in control 1N mice (n=4), and in dead cell-containing PFCE beads and cell-free PFTBA beads implanted in control 2N mice (n=3). **p<0.05, compared between experimental and control 1N mice, the latter with nested PFC groups; *p<0.05, compared between experimental and control 2N mice; ##p<0.05, compared to day 1 in cell-free beads in experimental mice; #p<0.05, compared to day 1 in cell-containing beads in experimental mice. All comparisons analyzed using one-way analysis of variance with general linear model.