How do the seeds of jequirity bean plants differ from edible beans?

The primary difference between the seeds of the jequirity bean (Abrus precatorius) and those of edible beans is their toxicity. While many members of the Fabaceae family produce edible seeds, the jequirity bean contains a highly potent toxin called abrin. The consumption of even a single chewed seed can be fatal to an adult human.12

In contrast, edible beans are a staple food source, though it is important to note that many legumes require proper preparation to be safe for consumption. Beyond their toxicity, jequirity beans are distinct for their striking red-and-black coloration, which makes them popular for decorative uses such as rosaries, necklaces, and percussion instruments, rather than for food. They have also historically served as a traditional unit of weight in India known as a ratti.132