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embryos are not ideal subjects in my view: they're very sensitive to things that wouldn't have any impact on fully formed subjects. So I would just park that concern for now.It's not poisonous, it's a possible endocrine interuptor .
Possibly cause cancer years later also. But are most things anymore.
https://pubmed.ncbi.nlm.nih.gov/36841402/
PSNP inhibited acetylcholinesterase and altered endocrine-related gene expression profiles both in the thyroid and glucocorticoid axes. At the whole organism level, we observed altered behaviors such as increased activity and anxiety at lower doses and lethargy at a higher dose, which could be due to a variety of complex mechanisms ranging from sensory organ and central nervous system effects to others such as hormonal imbalances. In addition, we present a hypothetical adverse outcome pathway related to these effects. In conclusion, this study provides new understanding into NP toxic effects on zebrafish embryo, emphasizing a critical role of endocrine disruption in observed neurotoxic behavioral effects, and improving our understanding of their potential health risks to human populations.