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<!-- Created: Thu Apr 30 20:05:29 UTC 2026 -->
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="pgen_DonaldPLehrMember_lbl" xml:lang="en-US">Donald P. Lehr [Member]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="pgen_HarryThomasianJrMember_lbl" xml:lang="en-US">Harry Thomasian Jr. [Member]</label>
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