SAR1B and chylomicron retention disease: Real time quantitative PCR (Figure 5) showed that the expression of SAR1B was significantly (p < 0.01) decreased (between 1.4 and 3.5 fold) in the duodenal biopsies of the Anderson's disease patient AD3, as compared to biopsies of 4 healthy adults (aged 54 to 64 years old), a young adult (23 years old) obtained on two separate occasions and 2 children (4 and 8 years old) one of which was obtained on two separate occasions.