A Rho-independent transcription terminator structure that is probably involved in regulation is included at the 3′ end in many examples of L20 ribosomal protein leaders.

All three types of leader exhibit apparent similarities to the region of Ribosomal RNA to which the L20 protein normally binds.

[1] However, in terms of RNA secondary structure, the context of the similar region is distinct in each leader type.

[1] A fourth example of an L20 ribosomal protein leader was predicted in Deltaproteobacteria using bioinformatic approaches.

[2] Like the three experimentally validated kinds of leader, the Deltaproteobacterial version resembles the relevant portion of ribosomal RNA, but presents this similarity in yet another structural context.