AUTHOR=Amar Laurence, Seitz Hervé TITLE=Editorial: miRNA Regulatory Pathways in Metazoans. Advances From in vivo and ex vivo Studies JOURNAL=Frontiers in Genetics VOLUME=10 YEAR=2019 URL=https://www.frontiersin.org/articles/10.3389/fgene.2019.00147 DOI=10.3389/fgene.2019.00147 ISSN=1664-8021