x inactivation造句

• Dicer is an RNAi enzyme and it is believed to cleave the duplex of Xist and Tsix at the beginning of X inactivation, to small ~ 30 nucleotide RNAs, which have been termed xiRNAs, These xiRNAs are believed to be involved in repressing Xist on the probable active X chromosome based upon studies.
• This group of epigenetic changes that depend on the chromosome's parent of origin ( including both those that affect gene expression and those that do not ) are called parental origin effects, and include phenomena such as paternal X inactivation in the marsupials, nonrandom parental chromatid distribution in the ferns, and even mating type switching in yeast.
• "EFHC2 " is located on the negative strand ( sense strand ) of the X chromosome at p11.3 . " EFHC2 " is also one of a few, select number of genes with in vitro evidence suggesting that it escapes X inactivation . " EFHC2 " spans 195, 796 base pairs and is neighbored by " NDP ", the gene encoding for Norrie disease protein.