18403
An extreme example is Dravet syndrome ( DS ) , an infantile - onset severe epilepsy caused by heterozygous loss of function mutations in SCN1A , the gene encoding the brain type - I voltage - gated sodium channel NaV1 . 1 .
 Chemical: sodium
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: sodium