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the cat fancy population; perhaps some cats or kittens had been taken home as pets and bred. a new mutation in a completely different gene location a new mutation at the same location as his Barrington Brown gene an independent recurrence of the Barrington Brown mutation. To identify the relationship, if any between the Barrington Brown cats and those with "double dilution" would require test-matings between the new "doubly diluted" cats and some known Barrington Brown cats. Since there were no known Barrington Brown cats outside of the laboratory and the lab colony had been terminated, this wasn't possible. In the 1970s, Pat Turner stated, without any supporting evidence, that caramel (the double dilution mentioned by Shaw) was the same as Barrington Brown. The dilute modifier (caramel) colours are not