Proximal part of the ciliary shaft to which the inversin protein (also called Inv) specifically localizes. The inversin compartment appears to have a different protein composition than the rest of the cilium, although there is no structure that separates it form the distal part of the cilium. [ GOC:cilia http://www.ncbi.nlm.nih.gov/pubmed/19050042 ]
Synonyms: flagellar inversin compartment Inv compartment of the cilium cilial inversin compartment flagellum inversin compartment cilium inversin compartment