In order to study the function of DNA, RNA, and protein as well as their relationship, it is very important to get RNA, DNA, and protein from the same piece of tissue. BioChain's Dr.P kit, a patent pending technology, provides a convenient and efficient system for isolation of DNA, RNA, and protein from the same piece of tissue simultaneously. The isolated RNA can be used for mRNA isolation, probe generation, RT-PCR, Northern blot analysis, primer extension, RNA protection assay, and in vitro translation. The isolated DNA can be used for PCR amplification. And the isolated protein can be used for Western Analysis. The kit contains enough reagents for isolating DNA, RNA, and protein from 5 grams of tissue and cells.