19221
Specific rabbit anti - Mlat serum ( titer higher than 18 , 000 ) does not show any protective ability against this toxin , nevertheless it was able to recognize protein bands in six out of twelve Micrurus venoms showing the existence of two distinct antigenic groups for alpha - neurotoxins in North American coral snakes species .
 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