A ciliary protein complex involved in cilium biogenesis. It consists of at least seven Bardet-Biedl syndrome (BBS) proteins and BBIP10. It moves in association with IFT trains through cilia (likely as an IFT-A/B adaptor or cargo), and is required for the integrity of IFT-A and IFT-B. [ http://www.ncbi.nlm.nih.gov/pubmed/17574030 http://www.ncbi.nlm.nih.gov/pubmed/15231740 http://www.ncbi.nlm.nih.gov/pubmed/26498262 ]