According to the literature structural domains that comprise this superfamily are found on the C-terminus of folliculin, but since there is only one structure in the PDB which shows this, it has not been included in the name as definitive.

It is also important to note that in the UniProt keyword pairs the term "tpr repeat" comes up quite a number of times. After comparing structures of folliculin with that of TPR repeats and the superfamily representative domain it can be seen that the TRP motif is a subdomain of the superfamily representative domain, comprised by the two small alpha helices which are linked together by a short loop.