Dollo’s law: A biological generalization positing that complex characters, once lost in evolution, are extremely unlikely to reappear and thus the loss of complex characters is virtually always irreversible.

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#XL - T Zoology

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Root apical meristem

Growth  occurs  just  behind  the  tip  in  three  overlapping  zones  of  cells at  successive  stages of  primary  growth.  These  are  the  zones  of  cell  division,  elongation, and differentiation

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#XL - T Zoology

NOD1 also provides protection against the intracellular protozoan parasite Trypanosoma  cruzi,

NOD2 activates responses to some viruses, including influenza.