Comparisons of nidogen protein structures and
sequences. (A) Domain structures of C. elegans NID-1,
mouse nidogen-1 (Mann et al., 1989), human nidogen-2
(Kohfeldt et al., 1998), and Ascidian nidogen (Nakae
et al., 1993). Domains are represented as follows: ▪,
G1; □, G2; ○, EGF; ▨, thyroglobulin; ⋄, YWTD motif (Springer,
1998). EGF repeats that are present in all forms are colored black, the
NID-1A-specific EGF is dark gray, and the NID-1A– and B–specific EGFs
are light gray. The extents of domains for NID-1A are indicated at the
top. (B) Sequence alignment of the G1 through G2 domains of NID-1,
mouse nidogen-1, and human nidogen-2. Identical residues are shown as
white letters on black background; similar residues are black letters
on gray background. Levels of sequence identity and similarity are
presented in Table 1. (C) Sequence alignment of the G3 domains of
NID-1, mouse nidogen-1, and human nidogen-2. Residues are highlighted
as described for B.