Fig. 8.

Putative theanine biosynthetic pathway in C. sinensis. a The theanine biosynthetic pathway. The blue numbers in the brackets following each gene name indicate the numbers of unigenes. GS, glutamine synthetase; GLS, glutaminase; ALT, alanine aminotransferase; ADC, arginine decarboxylase; TS, theanine synthetase. b Expression levels of candidate theanine biosynthetic unigenes expressed in different tissues. The tissues are listed horizontally, and the unigenes are listed vertically. The corresponding gene names from public transcript databases are listed on the right. All of the RPKM (reads per kilobase per million reads) values of the unigenes are shown as logarithms. Pearson correlation was used when genes in rows were clustered, and the maximum distance was used when tissues in columns were clustered