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Cultivation techniques. Diffusion chamber (a), hollow-fiber membrane chambers (b), and encapsulated gel microdroplets (c). Modified from Kaeberlein et al. (2002, ©The American Association for the Advancement of Science), Aoi et al. (2009, ©American Society for Microbiology) and Ben-Dov et al. (2009, ©John Wiley and Sons), respectively
