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That liquid was mostly water, with the rest being acetophenone, a non-hazardous commercial chemical.

The concentration of the acetophenone was “equivalent to one grain of sand in one million grains,” park officials said.

What’s more, when researchers dissected the brains of the offspring, they found more neurons or brain cells that detect the acetophenone than in the brains of control mice.

The molecule with the most attraction, acetophenone, which increases in people and mice with dengue or Zika, was then applied to the hands of human volunteers.

The researchers are now looking for treatments that target acetophenone.