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Fig. 5. Myoglobin gene disruption strategy. (A) The myoglobin (Mb) gene
consists of three exons. To produce knockout mice that lack myoglobin, exon 2
was replaced with a neomycin cassette (neo), and homologous
recombination technology was used as previously described
(Garry et al., 1998). (B)
Compared with the wild-type adult soleus muscle (above), which is an oxidative
muscle group, the myoglobin-deficient soleus muscle (below) was
depigmented.