1061
Remarkably , U21 contains a long stretch ( 13 nt . ) of complementarity to a highly conserved sequence in 28S rRNA .
 GENE: U21; GENE: 28S rRNA
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: U21, 28S rRNA 
Answer:
 GENE: U21; GENE: 28S rRNA