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Choice of Known indels file for local realignment

Dear all:

I am following a pipeline in an article to realign WGS reads to GRCh38 in an ALTs aware manner. I plan to use gatk 3.7 to do the local realignment.
I am wondering is it OK to use "Homo_sapiens_assembly38.known_indels.vcf.gz" on the google cloud bucket as a known indels file for local realignment with "IndelRealigner"?
And is this the 1000 genome phase3 known indels file?

I know that gatk4 no longer does realignment. But I still need to do it. I am just confused about which known indels file to use, since I want to process reads re-aligned to GRCh38.

Many thanks,
Yidong Zhang
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