The phrase "selected genes" refers to specific genes or segments of DNA that have been chosen or picked out for further study or analysis. Full definition
They work by binding to receptors inside a cell, which then travel to the nucleus and act on the DNA by turning select genes on and off. (sciencedaily.com)
Cells can be transfected with selected genes with specific properties as a means of evaluating the mechanisms of interaction between cells and chemicals. (sciencemag.org)
A scan for positively selected genes in the genomes of humans and chimpanzees Nielsen, R., C. Bustamante, A. G. Clark, S. Glanowski et al. 2005. (nielsenlab.org)