In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.

[Q]:  A rare tRNA - Arg ( CCU ) that regulates Ty1 element ribosomal frameshifting is essential for Ty1 retrotransposition in Saccharomyces cerevisiae .
[A]: Ty1 element


[Q]:  Lastly , several restriction length polymorphisms were identified and mapped within a 1 kb region located immediately upstream from the JH cluster .
[A]: JH cluster


[Q]:  Two genes ( ptsI and ptsA ) that encode homologues of the energy coupling Enzyme I of the phosphoenolpyruvate - dependent sugar - transporting phosphotransferase system ( PTS ) have previously been identified on the Escherichia coli chromosome .
[A]:
Enzyme I