Table 1. Annotated 5′ untranslated sequences for all annotated transcripts were extracted from the reference Chlamydomonas genome and analyzed for potential uORF content.

	uORF Classes Present
Number of Transcript Models	1	2	3
6438	—	—	—
769	+	—	—
821	—	+	—
6693	—	—	+
421	+	+	—
1600	+	—	+
1514	—	+	+
1270	+	+	+
Sums
4060	+
4026		+
11077			+

For schematic of classes see Figure 1. Class 1: ATG in 5UT sequence, in-frame with reference CDS, without intervening stop codon; class 2: ATG in 5UT sequence, out-of-frame with reference CDS, without intervening stop codon; class 3: ATG in 5UT sequence, with stop codon in-frame before the reference CDS. A given transcript can in principle have any number of each class. Sums: total transcripts containing at least one of the indicated class of uORFs.