What Kind of Wolf?

What is a "canis"? asks blogger Dog Zombie at Scientific American. "The more you dig into wild canines in North America, the more unclear it is where any species lines should be drawn," Dog Zombie says. A paper in Genome Research from earlier this year used SNP genotyping to look at variation at more than 48,000 loci in wolves and related species, and, as Dog Zombie points out, shows that many wolves and coyotes are admixtures of wolf, coyote, and dog.

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In PNAS this week: analysis of proteolytic enzymes secreted by circulating tumor cells, phylogenetic study of Fv1 evolution, and more.