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mNav2.3 - a NaCh isoform that was investigated by cloning of a full-length cDNA from the mouse AT-1 atrial tumor cell line  - is overall 68% identical to hNav2.1 with similar sequence in functionally relevant regions such as pore-forming segments, positively charged S4 segments, and inactivation gate sequence. Analysis of the mNav2.3 mRNA expression during cardiac and skeletal muscle development indicates tight developmental control over gene expression while transcript levels in uterus during pregnancy vary and dramatically decrease following delivery. Taken together, these data indicate that the Na2 subfamily is conserved across species and likely to play important physiological roles in cardiac and uterine muscle. 
Scn7a (also known as NaG; Nax; Nav2; Scn6a; Nav2.3; AI642000; 1110034K09Rik) encodes Nav2.3, the alpha unit of a voltage gated sodium channel, type VII, in Mus musculus. The human homologue of the gene is SCN7A (the same as for Nav2.1 and Nav2.2?). RGDID:1601888
mNa,2.3 expression in mouse heart localized with glial and axon-specific antibody binding. A similar staining pattern was observed in quiescent uterus. 
mNav2.3 can be found in mouse atrial myocytes. 
During late pregnancy the mNa,2.3 expression associated with nerve disappeared, probably due to the denervation that occurs during pregnancy ,, , . In contrast, mNa,2.3 expression appeared in both longitudinal and circular uterine smooth muscle. The myocyte expression of mNa,2.3 reached a maximum at term and quickly declined 2 days after delivery.