... are expressed in the same tissues and cell types and whether these isoforms playthesamerole.To address the first of these questions, we have nowstudied the expression of aralar1 and citrin throughoutmouse ... amounts of the protein and the densities of the immunoreactive bands. The analysis indicated that spleen,heart (particularly the ventricle), ovary, and stomach havesimilar levels of citrin and ... kidney [6,18] and human kidney cell lines[12,18], therefore it may compensate for the loss of citrin in the kidney of patients with CTLN2. This raises a generalquestion of whether the two isoforms...