Comparison of Percent Present calls of rhesus samples hybridized with human and rhesus macaque GeneChips. Percent Present called after hybridization of the rhesus samples with the human Affymetrix GeneChip (hgu133plus2) (dark bars) and the rhesus macaque GeneChip (light bars). Y – axis indicates the percent of total probesets scored present using the standard Affymetrix default parameters. X – axis indicates the results obtained with each rhesus macaque sample. "B, F, P, T, H" represent Brain (Cerebral Cortex), Fibroblast, Pancreas, Testis and Thymus, respectively. Numbers represent each of two replicates for each tissue sample.