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MKK4 is resistant to processing by pea stromal processing peptidase (SPP). (A) Radiolabelled pea plastocyanin precursor (accession number P16002) was incubated with either buffer alone or with a crude pea SPP preparation. (B) Similar assays were performed with in vitro-translated MKK4 and CA-MKK4 proteins. B, buffer only; SP, stromal peptidase.
