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Fig. 2. Domain architectures I: cell-surface proteins, cell-surface receptors and
cell-surface proteins with unusual domains. 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 of
Fig. 3. The two parallel, grey
lines represent the cell membrane. Parts of proteins above the lines are
extracellular, parts below the lines are intracellular. Drosophila
proteins are in black, C. elegans proteins are in blue text. GPI,
glycosyl-phosphatidylinositol anchor.