The block list represents high noise regions in the panel where false positive variant calls are likely produced. As a result, all positions in the gVCF are marked as Filter=excluded_regions to indicate variant call results are not reliable in such regions.
The block list includes the following genes:
HLA A
HLA B
HLA C
KMT2B
KMT2C
KMT2D
chrY
Any position with VAF 1% occurrence in six or more of the 60 baseline samples.