Fig. 4: Location of polymorphic sites.
From: Unusual traits shape the architecture of the Ig ancestor molecule
A cartoon and surface representation are shown for SAML Ig-EV and RTK Ig-C1 domains, with the polymorphic sites highlighted in greencyan color. The diagram indicates the location of the polymorphic residues (blue circles) along the whole ectodomain of RTK. Those regions that could not be built for RTK due to poor or negligible electron density signal have been replaced by their equivalents in SAML. The numbering of residues is indicated according to the PDB (8OVQ for SAML and 8QPX for RTK).
