AUTHOR=Battastini Ana Maria Oliveira , Figueiró Fabricio , Leal Daniela Bitencourt Rosa , Doleski Pedro Henrique , Schetinger Maria Rosa Chitolina TITLE=CD39 and CD73 as Promising Therapeutic Targets: What Could Be the Limitations? JOURNAL=Frontiers in Pharmacology VOLUME=12 YEAR=2021 URL=https://www.frontiersin.org/journals/pharmacology/articles/10.3389/fphar.2021.633603 DOI=10.3389/fphar.2021.633603 ISSN=1663-9812