ATGCH (ARABIDOPSIS THALIANA GTP CYCLOHYDROLASE II); 3,4-dihydroxy-2-butanone-4-phosphate synthase/ GTP cyclohydrolase II. Identical to Riboflavin biosynthesis protein ribBA, chloroplast precursor [Includes: 3,4-dihydroxy-2-butanone 4-phosphate synthase (RIBBA) [Arabidopsis Thaliana] (GB:P47924;GB:Q9SBA8); similar to riboflavin biosynthesis protein, putative [Arabidopsis thaliana] (TAIR:AT2G22450.1); similar to unnamed protein product [Vitis vinifera] (GB:CAO43134.1); similar to GTP cyclohydrolase II/3,4-dihydroxy-2-butanone 4-phosphate synthase [Malus x domestica] (GB:AAQ03091.1); similar to unnamed protein product [Vitis vinifera] (GB:CAO23