4927
In both shoots and roots , GT - 2 protein is undetectable in meristematic tissue but becomes expressed at later stages of cellular development , consistent with a role in contributing to the pattern of phytochrome A gene expression .
 GT - 2 protein, phytochrome A gene
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 GT - 2 protein, phytochrome A gene