
Correlation studies. Identical replica plates containing 81 cDNA samples obtained from brain. The samples were extracted in triplicate from 27 individuals. The replica plates were used to measure twice the expression of ACTB (A) or D5 (C). Two reference genes (ACTB and GAPD) show a correlation of 96% (B). A gene with high between-individual variability (D5) showed a low correlation to actin expression levels (D). Axes show logarithm of measured number of cDNA copies.











