[Objective]To testify and establish a effective RT-PCR for cystathionine beta-synthase(CBS) in partridge liver tissue.[Methods]Four methods were used in total RNA extraction: One-step Method,Improved One-step Method,Guanidinium Isothiocyanate Method(repetitive extraction)and Guanidinium Isothiocyanate Method(one-step).Meanwhile,partridge CBS primers were designed according to CBS cDNA consensus sequence.Then CBS gene RT-PCR were carried on to evaluate and filt these primers.[Results]Except Improved One-step...