Assertion: chromosome's copy | /r/AtLocation | another chromosome
Facets:
Source sentences:
text: Affected people have two normal copies of chromosome 13, plus an extra copy of chromosome 13 attached to another chromosome.
text: As a result, a person has the usual two copies of chromosome 21, plus extra material from chromosome 21 attached to another chromosome.
text: Affected people have two copies of chromosome 13, plus extra material from chromosome 13 attached to another chromosome.