This family is found in the intracellular N-terminal region of the Teneurin family of proteins. These proteins are 'pair-rule' genes and are involved in tissue patterning, specifically probably neural patterning. The intracellular domain is cleaved in response to homophilic interaction of the extracellular domain, and translocates to the nucleus. Here it probably carries out to some transcriptional regulatory activity. The length of this region and the conservation suggests that there may be two structural domains here (personal obs:C Yeats).