PROBLEM TO BE SOLVED: To quickly obtain/develop "a polynucleotide as an inner standard used as a standard of a gene expression level in test samples for correcting a transfer product quantity, when a difference between the expression levels of desired genes in two or more test samples is measured as a difference between the transfer products of the genes", since the use of the polynucleotide is essential on a gene expression analysis, but such the polynucleotide has sufficiently not been known in small monkeys at the present time.;SOLUTION: This cyclophilin A gene originated from Callithrix Jacchus is provided, and a polynucleotide is characterized by being the cyclophilin A gene originated from Callithrix Jacchus or its partial fraction and having either base sequence belonging to a base sequence groups comprising a base sequence represented by the sequence No. 1 or the like.;COPYRIGHT: (C)2006,JPO&NCIPI
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