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Ice-binding activity of cell-free culture medium of two Antarctic strains of Chlamydomonas sp. ICE. The photos show pitting on the basal plane of a submerged ice crystal caused by binding of ice-binding proteins. (A) Chlamydomonas sp. ICE-MDV from Lake Bonney. (B). Chlamydomonas sp. ICE from Prydz Bay, kindly provided by Chenlin Liu. The latter was freeze-dried for shipment and re-dissolved in water. Scale bars, 500 μm.
