1061
Remarkably , U21 contains a long stretch ( 13 nt . ) of complementarity to a highly conserved sequence in 28S rRNA .
 GENE: U21; GENE: 28S rRNA
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: U21; GENE: 28S rRNA