14892
Antisera from horses immunized with individual crotoxin or PLA2 , although in lesser titers , were also able of recognizing the toxins in all four Crotalus species and neutralize the lethality of the C .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None