Macrophage recruitment in the bioimplant model in B6, 129, and mixed background strains (M1–50 % B6: 50 %129, M2–75 % B6: 25 %129. A. Number of macrophages attached to biopolymer disks. B. Total number (attached to disk plus lavage) of macrophages. Values are the mean ± SEM of 5–38 mice per genotype. Symbols indicate a difference between values from B6 and A/J or 129, determined by one-way ANOVA and Newman-Keuls post-test. *P <0.05, **P <0.01, ***P <0.001.