Interrelationships among glypican proteins. The phylogeny was inferred using the neighbor-joining method. The tree is a bootstrap consensus generated from 1,000 replicates using the MEGA4 program suite . The percentage of replicates in which the associated sequences cluster is shown next to branches. All positions containing gaps were eliminated from the dataset. The bar at the bottom indicates proportion of amino-acid differences. The species used are human (Hs), mouse (Mm), zebrafish (Dr), purple sea urchin (Sp), and fruit fly (Dm). Dlp, Dally-like protein. NCBI accession numbers for the sequences used in the analysis are as follows: HsGPC1, NP_002072.2; HsGPC2, NP_689955.1; HsGPC3, NP_004475.1; HsGPC4, NP_001439.2; HsGPC5, NP_004457.1; HsGPC6, NP_005699.1; MmGPC1, NP_057905.1; MmGPC2, NP_766000.1; MmGPC3, NP_057906.2; MmGPC4, NP_032176; MmGPC5, NP_780709.1; MmGPC6, NP_001073313.1; DrKNY, NP_571935; DmDally, AAA97401.1; DmDlp, AAG38110.1. Sea urchin sequences obtained from models generated in the Sea Urchin Genome Project  are as follows: SpGPC1/2/4/6, GLEAN3_03084; SpGPC3/5, GLEAN3_13086. A scan of the zebrafish genome reveals additional GPC family members, but complete transcript sequences are not available. The full complement of GPC genes is shown for the other species.