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"I went [to the top of] Vehicle Assembly Building and looked down, and tears burst from my eyes. The size of this cathedral where the Rockets take off to go to the moon is so amazing."
- Ray Bradbury

Nucleocat Cureall  
  Only human cells can survive contact.  

In the Explorer, stored carefully in sealed tanks and containers, was the ultimate, multi-purpose cureall. It was a solution of enzymes so like the key catalysts of the human cell nucleus that it caused chemical derangement and disintegration in any non-human cell. Nothing could live in contact with it but human cells; any alien intruder to the body would die. Nucleocat Cureall was its trade name.
From Contagion, by Katherine MacLean.
Published by Galaxy Science Fiction in 1950
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