FIG 4.

Coomassie blue-stained SDS-PAGE gel of total proteins extracted from cultures of Synechocystis PCC 6803 mutants expressing EYFP from different locations using the promoters shown above the gel. Lanes were loaded on an equal-total-protein basis. The band for EYFP is indicated by the arrow, and phycobiliproteins are indicated by asterisks. M.W., molecular weight (in thousands). The gel shown here was spliced along the dashed lines to remove two lanes containing samples not discussed in this work.