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In vitro cytotoxicity was tested on five different cell lines : rodent mouse melanoma cells ( B16 - F1 ) and Chinese hamster ovary ( CHO ) cells , and three human cell lines - epithelial colorectal adenocarcinoma cells ( CACO - 2 ) , liver hepatocellular carcinoma cell line ( Hep G2 ) and endothelial umbilical vein cell line ( EA . hy926 ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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