Nerve (blue) sends signals (small blue balls) to muscle (brown) to contract. These signals bind to the receptor (green), but a sugar (white) - that is unique to the cobra - , prevents the binding of the cobra neurotoxin (red).   In humans, there is no sugar on the receptor therefore the neurotoxin binds to it. Neurotoxin binding prevents signal binding to the receptor leading to muscle paralysis.
In humans	In the cobra