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Distribution of 5′UTR lengths in S. agalactiae. Numbers of mRNA individual 5′UTRs according to their length based on 891 primary TSSs upstream coding genes. 78 genes were considered as leaderless with 5′UTRs shorter than 5 nucleotides, as indicated by the red box. 49% of the 5′UTRs have a size comprised between 15 and 35 nucleotides as indicated by black vertical lines
