1.   The inchlong frog, a protected species with a bright-red body and blue legs, secretes a poison from its skin.

2.   Many victims, including at least six infants, have developed a complication that attacks the kidneys as the bacteria attaches to the intestinal lining and secretes its poison.

3.   The blood cells had been given a gene that let them secrete the poison, which specifically targeted the tumors.

4.   The black-and-yellow frogs secrete a poison used by Amazon Indians for arrows and darts.