Figure 2.

Schematic representation of domain architecture of human, mouse, Xenopus laevis and X. tropicalis FcR-like proteins. The structure of X. laevis molecules is deduced from cDNA sequences, whereas the structure of X. tropicalis molecules is predicted based on the genomic sequences and confirmed by the EST cDNA sequences (marked with asterisk). The Ig-like domains belonging to the D1-D6 structural subtypes are shown by circles and the TM regions by thick lines. Thin lines and rectangles designate cytoplasmic tails and YxxV/L/I motifs, respectively. The color pattern for the Ig-domains subtypes and transmembrane types are as in Fig. 1. Paired receptors with similar extracellular regions but distinct TM regions are boxed.