a
b
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Quantitative Two-Step RT-PCR for the Detection of Human ABCAI Transporter on LightCycler . .
Amplification
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Fig.2a,b,c.Detection and quantification of ABCAI product in the LightCyder using the Hybridization Probe Format and standard curve. Serial dilutions (10 pg, 1 pg, 0.1 pg) of in vitro transcribed
ABCAI cRNA fragment (external standard) were first reverse transcribed and 1/10 of each RT
reaction mixture (10 pg, 1 pg, 0.1 pg, 0.01 pg) was amplified (a) to generate a standard curve for
absolute ABCAI and PBGD transcript quantification (b) and a melting curve analysis (c). The Y
intercept =11.52, equivalent to the log of the amount of PCR product at the crossing point-Cp
divided by the log of the efficiency of the reaction E; E=10 -l/slope =10-11- 3.903=1.80; slope =-3.903,
equivalent to -lIlog E; error =0.0225 (mean squared error), r 2 =1 (regression coefficient). The Cp
values of the unknown sample are converted to concentrations, using the equation derived from
the standard. Gel analysis of standard amplifications in 2% agarose is displayed (b). Only specific
products of each dilution at approximately 200 bp are visible. (M:l-kb marker)
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