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"In my mind I have gone all over the universe, which may make it less important for me to make piddling little trips... I did enjoy seeing Stonehenge. It looked exactly the way I thought it would look."
- Isaac Asimov

Ontogenetic Adaptation  
  Immediate genetic-level ability to eat alien plants.  

Half a minute later, she nibbled tentatively at a crisped leaf of the cabbage, announced with surprise that it was indeed delicious and helped herself to more. On the third leaf, she uttered a wild whoop, doubled up, and began to adapt at speed. That took about twelve seconds, but they allowed a full ten minutes then to let the reaction flush her blood stream. Then Vernet was sampled in turn and staggered back to the beach with a martyred expression, while Klim and Muscles started cabbage-hunting. Grevan retired to the ship's laboratory, where he poured the half cupful of blood he had extracted from the martyr's veins carefully into a small retort. Ontogenetic adaptation, with reaction-times that crowded zero, to anything new in the way of infections or absorbed venoms was one of the more useful talents of their specialized strain. Considerable unauthorized research and experimentation finally had revealed to them just how they did it. The invading substance was met by an instantaneous regrouping of complex enzyme chains in every body cell affected by it, which matched and nullified its specific harmful properties and left the Group member involved permanently immune to them.

The experience of getting immunized sometimes included the momentary impression of having swallowed a small but active volcano, but that illusion didn't last long enough to be taken very seriously by anyone but the sufferer. Vernet's blood emerged from processing presently in the shape of small pink pills; and just before dinner everybody washed down two each of these and thus adapted the easy way, while the donor denounced them as vampires.

From The End of the Line, by James Schmitz.
Published by Not Known in 1951
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