The usefulness of Envirologix Cry1Ab/Cry1Ac QuantiPlate Kits for quantitafication of the Cry1Ac content was determined with two Bt transgenic cotton varieties,NUCOTN 33 B and NUCOTN 99 B,and a non-Bt variety,Sumian 12(as a control).The results showed that there were some obvious differences in the amount of Cry1Ac protein present in various plant parts throughout the growing season.The expression levels of Cry1Ac proteins in the terminal leaves of the main stem of NUCOTN 33 B and NUCOTN 99 B during the ...