Wageningen University, Laboratory of Microbiology, 6703HB Wageningen, Netherlands. leo.lahti@iki.fi|Wageningen University, Laboratory of Microbiology, 6703HB Wageningen, Netherlands. leo.lahti@iki.fi|Wageningen University, Laboratory of Microbiology, 6703HB Wageningen, Netherlands. leo.lahti@iki.fi|Wageningen University, Laboratory of Microbiology, 6703HB Wageningen, Netherlands. leo.lahti@iki.fi|Wageningen University, Laboratory of Microbiology, 6703HB Wageningen, Netherlands. leo.lahti@iki.fi