It was a late fall morning and hundreds of cows — black and white splattered Holsteins and cappuccino-colored Jerseys — milled about a San Joaquin Valley dairy farm in the largest milk-producing state in the nation. Nearby, workers herded some of the animals onto a rotating platform within the farm's milking parlor and quickly attached pumping equipment.
Sometimes these mutations have little effect on its ability to transmit between organisms or cause severe disease. But sometimes, they do.
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