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Anatomical aspects of four cacti with contrasting insect resistance using morpho-anatomical analysis and morphometry were evaluated. The following cacti were studied: F-21 [Nopalea cochenillifera (L.) Salm Dyck; IPA-200021]; Giant [Opuntia ficus-indica (L.) Mill.; IPA-100001]; IPA-20 [O. ficus-indica (L.) Mill.; IPA-100003] and Opuntia undulata Griffiths (IPA-200174). Previous research has indicated...