The turning of all or part of an organism in a particular direction in response to an external stimulus.
- This protein is embedded in and extends exterior to the viral lipid membrane and is primarily responsible for host cell receptor binding and host cell tropism.
- An envelope glycoprotein on the surface is thought to be responsible for mediating viral entry into cells, tissue tropism, and host range.
- It has a wide cell tropism and remains extra-chromosomal, therefore minimising the risk of insertional mutagenesis.
Late 19th century: from Greek tropos 'turning' (from trepein 'to turn') + -ism.
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