Fig. 3. Domain architectures II: secreted, extracellular matrix and muscle proteins. The domain architectures of IgSF proteins discussed in this work are shown as black lines representing their amino acid sequence and coloured symbols representing the domains. The legend for different domain types is at the bottom. Drosophila proteins are in black, C. elegans proteins are in blue text. GPI, glycosyl-phosphatidyl-inositol anchor.