text: The classification of AFPs became more complicated when antifreeze proteins from plants were discovered.  Plant AFPs are rather different from the other AFPs in the following aspects:
  #They have much weaker thermal hysteresis activity when compared to other AFPs.
  #Their physiological function is likely in inhibiting the recrystallization of ice rather than in preventing ice formation.
  #Most of them are evolved pathogenesis-related proteins, sometimes retaining antifungal properties.