Fig. 1. SPL3, SPL4 and SPL5 are structurally similar
and produce transcripts that are cleaved by miR156. (A)
Genomic structure of SPL3, SPL4 and SPL5. White boxes
indicate untranslated sequences; grey boxes indicate coding sequences;
horizontal lines indicate introns; vertical lines indicate transcription start
site or polyadenylation site identified by 5 ' or 3 ' RACE.
(B) Cleavage sites identified by 5 'RLM-RACE.