The distribution and spread of naturally occurring Medea selfish genetic elements in the United States

Sarah Cash, Fred Gould & Marce Lorenzen
Selfish genetic elements (SGEs) are DNA sequences that are transmitted to viable offspring in greater than Mendelian frequencies. Medea SGEs occur naturally in some populations of red flour beetle (Tribolium castaneum) and are expected to increase in frequency within populations and spread among populations. The large-scale USA distributions of Medea-4 (M4) had been mapped based on samples from 1993-1995. We sampled beetles in 2011-2014 and show that the distribution of M4 in the United States...
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These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
What does this mean?