What are the different ways in which glycans can mediate vs modulate biological functions?
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As with other major macromolecules, the biological functions of glycans span the spectrum from relatively subtle to crucial for development, growth, maintenance, or survival of the organism that synthesizes them. For many glycans, a function is not yet evident. The same glycan may also have different functions depending on which aglycone it is attached. Over the years, many theories have been advanced regarding biological roles of glycans. Although there is evidence to support all the theories, exceptions to each can also be found. This should not be surprising, given the abundance and enormous diversity of glycans in nature. Complexities also arise because glycans are frequently bound by microbes and microbial toxins, making them a liability to the organism that synthesizes them
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