Editing Laboratory mouse (section)

=== Genome ===
Sequencing of the laboratory mouse [[genome]] was completed in late 2002 using the C57BL/6 strain.  This was only the second mammalian genome to be sequenced after humans.<ref name="Trouble" />  The [[haploid]] genome is about three billion [[base pair]]s long (3,000 Mb distributed over 19 autosomal chromosomes plus 1 respectively 2 sex chromosomes), therefore equal to the size of the human genome.{{citation needed|date=August 2021}}  Estimating the number of genes contained in the mouse genome is difficult, in part because the definition of a [[gene]] is still being debated and extended. The current count of primary coding genes in the laboratory mouse is 23,139.<ref name="Ensembl">{{cite web |title=Mouse assembly and gene annotation |url= http://useast.ensembl.org/Mus_musculus/Info/Annotation |work=[[Ensembl]] |access-date=29 July 2013}}</ref> compared to an estimated 20,774 in humans.<ref name="Ensembl" />