Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) MURPHY CL,"Differentiating embryonic stem cells : GAPDH, but neither HPRT nor beta-tubulin is suitable as an internal standard for measuring RNA levels",Tissue Eng,,,2002,8,,551-559,https://cir.nii.ac.jp/crid/1570572700696053248,https://doi.org/10.1089/107632702760240472