Comparison of Int group percentages between tissues harvested from pigtailed macaques 5 or 7 days postinfection and SIVsmmFGb stock virus. Grouping of stock virus and tissue-derived sequences, as well as statistical comparisons, were performed as described in Figs. 1 and 3 and Materials and Methods. Statistically significant differences (p < 0.05) are noted. Error bars represent 1 standard error. Results are shown for (A) axillary lymph node, (B) basal ganglia, (C) cerebellum, (D) midfrontal cortex, (E) hippocampus, and (F) mesenteric lymph node. Tissues indicated by asterisks (***) lack data from PQo1; results are thus the average of the remaining five animals.