Mammalian cells are fragile and harder to grow than other cell types (such as yeast or bacteria), but their large-scale culturing is an economic boon because it allows for the production of proteins that are otherwise difficult/expensive/unethical to extract from living organisms. There are two basic ways of culturing animal cells:
From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.
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