6522
Stems contain distinctly less P protein mRNA and the relative level in roots is very low but still clearly detectable .
 GENE: P protein mRNA
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: P protein mRNA 
Answer:
 GENE: P protein mRNA