Fig. 4. Sequence analysis of the 5'-end of thi1 mRNA. (A) Evidence
for a stable stem-loop structure in a region between the two in-frame start
codons (boxed). Predicted secondary structure of the 90 first codons of the
wild-type thi1 mRNA. Structure was generated for 28°C by using
the mfold version 2.3 program
(http://mfold2.wustl.edu/
mfold/rna/for1-2.3.cgi).
Black dots indicate G:C base pairs and grey dots indicate weaker A:U or G:U
base pairing. (B) Complementary sequence between thi1 mRNA and 18S
rRNA of A. thaliana. Vertical lines indicate base pairing and open
circles represent G:U base pairing.