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Micro-tube used for liquid chemical storage. The micro-tube holds 2 microlitres  (2 millionths of a litre) of a liquid mainly for archival storage at -20 degrees C. Large numbers of the tubes can be stored in a small space and when tagged by barcodes etc for efficient retrieval. Micro-tubes were developed by the Hoffman-La Roche pharmaceutical company to archive the many chemicals they develop and work with.