Figure 2.

Macrophage chimerism in adult isochronic and heterochronic parabiosis. Data represent the frequency of macrophages (CD11b^hiF4/80⁺) within the CD45·1 (adult) or CD45·2 (adult or old) compartment, respectively, from the indicated tissue. (a) Analysis of CD45·1 or CD45·2 macrophages in isochronic adult CD45·1 tissues. (b) Analysis of CD45·1 or CD45·2 macrophages in isochronic adult CD45·2 tissues. (c) Analysis of the frequency of adult or old macrophages in heterochronic adult tissues. (d) Analysis of the frequency of adult or old macrophages in heterochronic old tissues. Numbers of experiments, animals and statistical treatment and levels are as in Fig. 1.