There was no such enzyme - it is an urban legend. McDonalds has been the victim of a great many urban legends over the years.

there are 3 urban legend,

urban legends final cut - where they are in the film college and urban legends bloody Mary

Urban legends can come from any country.

They are not always called urban Legends. They can be called Urban Myths, Urban Tales or Urban Stories. And they are not necessarily from and 'Urban' origin.

Thomas Kerrimuir McDonald has written:

'Dunedin: an economic assessment' -- subject(s): Economic conditions

'Urban transportation and land use' -- subject(s): Land use, Urban transportation