When I was trying to characterize a set of proteins using Interpro, I came across the following scenario. One of the proteins there is a Leucine zipper domain (SSF57959 : Superfamily database). However, it was not recognized by PFAM or other databases. Also, bZIP related IPR004827 (interpro ID) was also not recognized there. I was using the presence of IPR004827 as a filtering step for bZIPs. My question is, can I identify this specific gene as a bZIP transcription factor, or do I need to exclude it? Thanks in advance!