Alternative splicing of exon 4 yields 2 transcripts termed A and B; the B transcript results in a C-terminally truncated protein. both transcripts are expressed in various tissues, including brain, but not in lymphocytes.Immunohistochemical analysis showed that staining for the EFCH1 protein overlapped with signals for the Ca(V)2.3 voltage-gated calcium channel (CACNA1E) at neuronal soma and dendr