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Maeri is a genetic chimera, meaning she is a mixture of two different genomes joined into one organism. In this case, she is joined straight down the middle. Her two "sister" halves have different blood types. Here's some more information about chimerism.
http://en.wikipedia.org/wiki/Chimera_%28genetics%29
http://boredomtherapy.com/wp-content/uploads/2014/05/animal-color-mutations-13.jpg
http://www.pawnation.com/2013/10/07/chimera-animals/10