Which preposition to use with precursor

of Occurrences 116%

I recognised the precursor of its becoming dangerous.

to Occurrences 8%

The University of Illinois at Champagne Urbana, where Mozilla, the precursor to Netscape, was first developed was a hotbed of new software development.

in Occurrences 5%

The lady of Huntly was indeed a worthy precursor in the great work of general education.

Which preposition to use with  precursor