Quantitative RT-PCR analysis of gustducin in the gastrointestinal tract of non-human primates. Plots show the expression level of gustducin mRNA in newborn (a, n = 2) and adult (c, n = 2) Japanese macaques and in newborn (b, n = 4) and adult (d, n = 3) common marmosets. Error bars indicate standard errors calculated from three independent experiments on each individual. Mean Ct values for GAPDH in each sample are 19.1 ± 1.7, 19.3 ± 1.1, 20.4 ± 1.4, 20.5 ± 1.3, 20.9 ± 1.9, 21.3 ± 1.9 for the tongue, oesophagus, stomach, small intestine, caecum and colon, respectively, of newborn marmosets. Mean Ct values for GAPDH in each sample are 16.5 ± 0.2, 17.0 ± 0.6, 19.7 ± 1.4, 18.9 ± 0.7, 19.5 ± 0.7 and 19.3 ± 0.7 for the tongue, oesophagus, stomach, small intestine, caecum and colon, respectively, of adult marmosets.