Both L LCN type CS-α/β A-G include Cys, indicating that their polymers have the potential to form disulfide bonds. L LCN type CS-α/β A and C are both greater than 60 nt in length. It demonstrates that S LCN type CS-α/β A and C are long-chain neurotoxins capable of activating Na + channels. L LCN type CS-α/β B, D-G is less than 30nt in length. They are short-chain toxins that inhibit voltage-dependent or Ca +2 -activated K+ channels and also partially activate sodium channels.