Figure 1From: Establishment of the 1st World Health Organization International Standard for Plasmodium falciparum DNA for nucleic acid amplification technique (NAT)-based assaysHistograms of laboratory estimates of polymerase chain reaction (PCR)-detectable units/ml (log 10 ) for samples AA, BB, CC and DD (panels A, B, C and D respectively). The laboratory code numbers are inicated in each box in the respective histograms.Back to article page