AUTHOR=Webster Nicole S. TITLE=Cooperation, communication, and co-evolution: grand challenges in microbial symbiosis research JOURNAL=Frontiers in Microbiology VOLUME=5 YEAR=2014 URL=https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2014.00164 DOI=10.3389/fmicb.2014.00164 ISSN=1664-302X