I've been looking at the chromosome painter and my matches in 23andMe, and realised I have a few chunks of DNA that are greyed out and read "not enough information", and therefore don't yield any matches on those segments. For demonstration purposes:
Digging further, all I could find was this little segment on 23andMe's Q&A page.
Gray regions in chromosomes 13, 14, 15, 21, and 22 represent parts of the genome where the DNA sequences in those regions are highly repetitive, hard to measure, and don't contain as much interpretable information. 23andMe doesn’t test any markers because the DNA sequences in those regions in these regions, which are called "acrosomes".
I can't find anymore information on "acrosomes" that is relevant to genealogy or genetics anywhere online.
Can anyone shed any light on this, and does this mean that potentially matches from other companies that might have a higher centimorgan count because they're actually sequencing and comparing more of the genome?