You can mix them by the same thing of generic
I attached a picture showing how to do it
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In 1668, Francesco Redi, an Italian scientist, designed a scientific experiment to test the spontaneous creation of maggots by placing fresh meat in each of two different jars. ... Redi successfully demonstrated that the maggots came from fly eggs and thereby helped to disprove spontaneous generation.
I believe its when you <span>silencing one of the two X chromosomes in female cells...
Hope I helped
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