4787
Saxitoxin ( STX ) is a low molecular weight neurotoxin mainly produced by certain marine dinoflagellates that , along with its family of similarly related paralytic shellfish toxins , may cause the potentially fatal intoxication known as paralytic shellfish poisoning .
 Chemical: Saxitoxin; Chemical: STX
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Saxitoxin; Chemical: STX