<?xml version="1.0" encoding="UTF-8"?><rss xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:atom="http://www.w3.org/2005/Atom" version="2.0"><channel><title><![CDATA[Invagination]]></title><description><![CDATA[<p dir="auto">One of the methods by which the various germinal<br />
layers of the ovum are <a href="/topic/266316/differentiated">differentiated</a>.</p>
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