Yes, buccal swab is ideal for genetic analysis, it is true. I also prefer working with blood.
I'll write an example that proves that everything is relative ...
Eury z Peronowki was tested in Laboklin. His results-negative. Valkýra z Molu Es tested in Prague (negative) and also in Laboklin - result - negative. Litter B Arqeva (Valkýra x Eury) was tested in Prague - the result - half puppies carrier. Why?
I asked the owner of Eury to repeat the test - the result - the carrier (Laboklin)
Both tests made from the same blood sample.
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Daniela
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