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. 2021 Aug 19;12(8):1266. doi: 10.3390/genes12081266

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Three-dimensional structures of ZPD subdomains ZP-N and ZP-C that are related to C- and V-type Ig-like domains. (A) ZP3 subdomain ZP-N and C-type Ig-like domains. β-strands are labeled using Ig terminology; helices are indicated by rectangles. Opposing β-sheets 1 and 2 are blue and green, respectively, with termini circled. The E′ strand is orange and disulfides magenta. (B) ZP2 ZP-C and V-type Ig-like domains. As in panel A, except for the additional A′ and C′/C″ strands that are yellow and red, respectively. This figure was adapted with permission from L. Jovine ([11], Figure 4), Copyright 2018.