Upcoming Ensembl Platform Transition

This is the final release of its kind on this website.

In summer 2026, this site will bring you to the new Ensembl platform currently at beta.ensembl.org.
Please bookmark this archive to retain access to the current site, tools and functionality until they are available on the new platform -> jun2026.archive.ensembl.org

Human vs Prairie vole LastZ results

Human (Homo sapiens, GRCh38) and Prairie vole (Microtus ochrogaster, MicOch1.0) were aligned using the LastZ alignment algorithm (LastZ) in Ensembl release 90. Human was used as the reference species. After running LastZ, the raw LastZ alignment blocks were chained according to their location in both genomes. During the final netting process, the best sub-chain was chosen in each region on the reference species.

Configuration parameters

ParameterValue
Gap open penalty (O)400
Gap extend penalty (E)30
HSP threshold (K)3000
Threshold for gapped extension (L)3000
Threshold for alignments between gapped alignment blocks (H)2200
Seed and Transition value (T)1
Scoring matrix (Q)
Default:
     A    C    G    T
    91 -114  -31 -123
  -114  100 -125  -31
   -31 -125  100 -114
  -123  -31 -114   91

Chunking parameters

ParameterHumanPrairie vole
Chunk size10,000,00010,100,000
Overlap0100,000
Group set size10,100,000
Masking options{default_soft_masking => 1}{default_soft_masking => 1}

Statistics over 1,534,163 alignment blocks

Genome coverage (bp) Coding exon coverage (bp)
Human

Uncovered: 2,099,668,716 out of 3,099,750,718
Covered: 1,000,082,002 out of 3,099,750,718

Uncovered: 2,732,972 out of 38,571,754
Matches: 29,340,504 out of 38,571,754
Mismatches: 5,883,724 out of 38,571,754
Insertions: 614,554 out of 38,571,754
Identity over aligned base-pairs: 81.9%

Prairie vole

Uncovered: 1,378,637,656 out of 2,287,357,235
Covered: 908,719,579 out of 2,287,357,235

Uncovered: 1,269,793 out of 30,375,214
Matches: 24,656,742 out of 30,375,214
Mismatches: 4,319,729 out of 30,375,214
Insertions: 128,950 out of 30,375,214
Identity over aligned base-pairs: 84.7%

Block size distribution

Size range All 1,534,163 alignment blocks Blocks grouped in nets
# blocks Total size (incl. gaps) # nets Total size (incl. gaps)
1 bp - 10 bp
22,657
153.6 kb
10 bp - 100 bp
148,679
8.0 Mb
11,261
770.1 kb
100 bp - 1 kb
1,016,389
469.7 Mb
44,372
16.9 Mb
1 kb - 10 kb
346,176
596.5 Mb
16,283
39.5 Mb
10 kb - 100 kb
261
3.4 Mb
1,206
30.2 Mb
100 kb - 1 Mb
1
139.6 kb
327
121.2 Mb
1 Mb - 10 Mb
211
685.4 Mb
10 Mb - 100 Mb
13
183.9 Mb