Complex sentence: The toxin acting on Na channels has a molecular weight of 12 kDa and consists of 105 amino acids, while the other GPT inducing a Ca influx has a molecular weight of 19 kDa.
Split into simpler sentences: The toxin acting on Na channels has a molecular weight of 12 kDa and consists of 105 amino acids. The other GPT acting on Ca channels has a molecular weight of 19 kDa.