Andersen, J. B. et al. New unstable variants of green fluorescent protein for studies of transient gene expression in bacteria. Appl. Environ. Microbiol. 64, 2240–2246 (1998).

Characterization of the most traditional C-terminal ssrA degradation tags, substrate to the endogenous E. coli protease ClpXP. The exact amounts to which the tags are degaded were not disclosed, so they are only displayed as general strength values.