Exploring microbial functional biodiversity at the protein family level - From metagenomic sequence reads to annotated protein clusters. - Fotis A. Baltoumas; Evangelos Karatzas; David Páez-Espino; Nefeli K. Venetsianou; Eleni Aplakidou; Anastasis Oulas; Robert D. Finn; Sergey Ovchinnikov; Evangelos Pafilis; Nikos Kyrpides; Georgios A. Pavlopoulos (Frontiers Bioinform., 2023)