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Image is used for direct identification of the visual appearance of the micro-biologicial species in the infobox of an article whose titular subject is the specific species which this media shows as it's prominent subject.
Whilst it is possible that a suitably equipped, lab would be able to produce an alternative image meeting the stated purpose, it would be implausible for an ordinary contributor to do so, hence it would be difficult for a "free" replacement to be provided, without considerable effort and access to specialist equipment.