Jean-Louis Tu asked:

>My question would be: would you happen to know whether some toxins have
>been identified in (ripe) fruits that are commonly used by humans, like
>apples or mangoes (these fruits are supposedly suitable for
>consumption by mammals).

I think a simple guideline would be whether a human (or mammal) would be
dispersing the seeds if they ate the fruit. Clearly with blackberries and
strawberries the seeds would be eaten and digested. With oranges I would
think the seeds would pass through unharmed and could grow in the feces.

Don.