Nygren,C.M., Edqvist,J., Elfstrand,M., Heller,G. and Taylor,A.F., Detection of extracellular protease activity in different species and genera of ectomycorrhizal fungi. Mycorrhiza 17 (3), 241-248 (2007). https://www.ncbi.nlm.nih.gov/nuccore/DQ658854