References:

1. T.P. Dick, et al. "Molecular evolution of transfer RNA from two precursor hairpins: implications for the origin of protein synthesis," JOURNAL OF MOLECULAR EVOLUTION 1995 Jul;41(1):1-9.

2. F. Huet, et als. "Puffs and PCR: the in vivo Dynamics of Early Gene Expression During Ecdysone Responses in Drosophila," DEVELOPMENT, 1993 Jun;118(2):613-27.

3. G. Miele, et als. "The Human Immunodeficiency Virus Type 1 5' Packaging Signal Structure Affects Translation but does not Function as an Internal Ribosome Entry Site Structure," JOURNAL OF VIROLOGY, 1996 Feb;70(2):944-51.