How to not print a line if it and the following line starts with the same pattern?

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I have a file.fa:

>ABC
TGTGTGT
AGAGAGA
TGTAGTA
>BDC
>DTR
>EDF
AGAGGTG
AGTGACA
CAGTGAC

I want to keep the lines without ">", and lines with ">" only if the immediate following line does not have ">":

>ABC
TGTGTGT
AGAGAGA
TGTAGTA
>EDF
AGAGGTG
AGTGACA
CAGTGAC

Looking at the answer for this post, I see that awk '/^>/{x=$0} !/^>/{if(x){print x;x=0;}}' file.fa prints out the header lines (with '>') that I want:

>ABC
>EDF

but how do I also get the lines of text without '>'?



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