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Reverse cleavage grade A embryo

Hi all 
I had a 5 day blastocyst transfer yesterday - this is my second round (4 trf) of IVF, the first (1 fresh and 2 frozen) was unsuccessful, with one miscarriage.

the embryo transferred was a grade A - by far the best quality we have had, but the embryologist did say that I should be aware that during development the embryo did something ‘funny’.  It went from 3 cells, to 4, back to 3 before reaching 4 again and developing well from there - this is apparently called ‘reverse cleavage’.  Has anyone heard of / experienced this? 

I’d be grateful for any information - can’t find much online. 

TIA x 
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