U.S. National Library of Medicine
A group of ALKALOIDS, characterized by a nitrogen-containing necine, occurring mainly in plants of the BORAGINACEAE; COMPOSITAE; and LEGUMINOSAE plant families. They can be activated in the liver by hydrolysis of the ester and desaturation of the necine base to reactive electrophilic pyrrolic CYTOTOXINS.
The numerical value of pyrrolizidine alkaloids in Chaldean Numerology is: 9
The numerical value of pyrrolizidine alkaloids in Pythagorean Numerology is: 3
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"pyrrolizidine alkaloids." Definitions.net. STANDS4 LLC, 2017. Web. 23 Apr. 2017. <http://www.definitions.net/definition/pyrrolizidine alkaloids>.