One could also track how that efficiency changed over time as various laboratories optimized both the design and preparation of CRISPR. In the Texas study, only 11 percent of mice progeny were fully albino, and pictures of the litters revealed a salt-and-pepper pile of infant pups, with quite a bit more pepper than salt. Barely a year later, a Japanese research team repeated the same experiment but with a few minor tweaks and achieved efficiencies of 97 percent, with thirty-nine out of forty pups displaying a radiant, homogeneous albino exterior.
