The bioreactor is for use in performing biological and/or biochemical reactions and includes a vessel, an agitator, a reaction assembly, and a harvesting outlet. The vessel of the bioreactor includes several ports including a mixing port, a reaction port, and a harvesting port. The agitator extends through the mixing port into the vessel while the harvesting outlet extends through the harvesting port and permits the withdrawal of reaction medium to another vessel. The reaction assembly extends through the reaction port into the vessel and has multiple components including a gas conduit adapted to introduce gas into a reaction medium in the vessel, a sampling device adapted to remove a portion of the reaction medium from the vessel without contamination of the remaining reaction medium, and an introduction conduit permitting the introduction of at least the reaction medium into the vessel.
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