Identification of cry-type genesTwo pairs of universal oligonucleotide primers to probe the most conserved regions of all known cryl and cry2 genes were chosen to analyse the nucleotide sequence of 20kb DNA preliminarily.

• 采用cry1和cry2基因的通用引物对20kb DNA上的核酸序列进行初步分析，结果表明该片段上含有这两类基因，而且cry1基因的拷贝数要低于cry2基因的拷贝数。