Calcineurin is an antagonist to PKA protein phosphorylation required for postmating filamentation and virulence, while PP2A is required for viability in Ustilago maydis
Molecular plant-microbe interactions : MPMI (2009) - Comments
pubmed: 19737102  doi: 10.1094/mpmi-22-10-1293  issn: 0894-0282 

John D. Egan, María D. García-Pedrajas, David L. Andrews, Scott E. Gold