A similar result was also reported in another Phytophthora–plant pathosystem, in which 12 cysteine proteases from P. infestans were found to accumulate at three different stages during infection of tomato plants (Zuluaga et al., 2016), four of which are orthologs of the cysteine proteases from P. parasitica (PpCys10, PpCys17, PpCys39, and PpCys53). Here, CTSB is linked to infection.