From that data, they found 33 locations on the genome that seem to be under strong selection pressure for resistance, with a hot spot located on chromosome 13. (scientificamerican.com)
Because metabolism is more efficient in smaller cells, it has been suggested that in flying species there is particularly strong selection pressure against genome growth [4, 8, 9]. (journals.plos.org)
«Pathogens face a very strong selection pressure from the host's immune system,» Brisson said. (sciencedaily.com)