ice nucleation activity https://github.com/geneontology/go-ontology/issues/29149 Catalysis of the formation of ice crystals in extracellular fluid at relatively high temperatures (up to -2 degrees Celsius) to protect the organism from damage by intracellular ice formation. This process is commonly found in certain bacteria, such as Pseudomonas syringae, and plays roles in environmental adaptation and plant pathogenesis. Note that this term was reinstated from obsolete. molecular_function TC:9.B.133.1.1 GO:0019833 ice binding