1644
Chromosome substitution strains ( CSS ) , in which a single chromosome from one inbred strain ( donor ) has been transferred onto a second strain ( host ) by repeated backcrossing , may be used to identify quantitative trait loci ( QTLs ) that contribute to seizure susceptibility .
 Disease: seizure
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: seizure 
Answer:
 Disease: seizure