It shows the amplification products after coamplification of the same volumes of DNA extracted from 0.5% (Lanes 1±4) and 2% (Lanes 5±8) Fluka reference material together with 25,000 copies of lectin le1 competitor using the lectin specific primers (Lanes 1±2 and 5±6) and 250 copies of the RRS specific competitor using the RRS specific Primers (Lanes 3±4 and 7±8) Two parallel PCR are shown for each sample. The upper bands represent the two original amplicons the lower ones represent the two (smaller) competitor amplicons. In Lanes 1±2 and 5±6 lectin le1 is ``matched'' as indicated by same band intesities for both amplicons in the reaction. In Lanes 3±4 the competitor band is stronger than the original RRS band thus indicating that the sample is below 1% RRS. In Lanes 7±8 the competitor signal is weaker, thus indicating the sample to be above 1% in RRS content