Patch release 4 is the fourth patch release for the GRCm38 assembly.
Patch release 4 includes all contents that were in patch release 3.
This is a minor release of GRCm38 that does not disrupt the coordinate
system in the reference sequence GRCm38.
Total patch scaffolds in this patch release: 122
Patch scaffolds of type FIX: 29
Patch scaffolds of type NOVEL: 93
ALT scaffold: A sequence contig/scaffold that is a haplotype sequence
to the reference genome indicated location.
FIX patch: A patch that corrects sequence or reduces an assembly gap
in a given major release. FIX patch sequences are meant to be
incorporated into the primary or existing alt-loci assembly units at
the next major release, and their accessions will then be
NOVEL patch: A patch that adds sequence to a major release. Typically,
NOVEL patch sequences are meant to be incorporated into the assembly
as new alternate loci at the next major release, and their
accessions will not be deprecated (UCSC term: "new haplotype sequence").