Fig. 1. Xenopus glypican 4 (Xgly4) is a novel member of the glypican family. (A) Phylogenetic tree of the glypican family. (B) The deduced 556 amino acid protein has a typical glypican structure with an N-terminal signal peptide (underline), an extracellular cysteine (red)-rich domain and three putative O-glycosylation sites (purple).