Yellow rain — a palynological analysis

@article{Nowicke1984YellowR,
  title={Yellow rain — a palynological analysis},
  author={Joan W. Nowicke and Matthew Meselson},
  journal={Nature},
  year={1984},
  volume={309},
  pages={205-206}
}
Yellow rain, purported to be an agent of toxin warfare in South-East Asia, contains a high percentage of pollen. Analysis of this pollen in yellow rain samples suggests that they are the faeces of honey bees. 
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References

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Presence of four Fusarium mycotoxins and synthetic material in 'yellow rain'. Evidence for the use of chemical weapons in Laos.
Analysis of a 'yellow rain' sample by selected ion monitoring revealed the presence of three trichothecenes: T-2 toxin, diacetoxyscirpenol and 4-deoxynivalenol in concentrations of at least 48, 42
The apology of yellow rain.