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. 2020 Jul 3;257(6):1531–1541. doi: 10.1007/s00709-020-01530-z

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© The Author(s) 2020, corrected publication 2021

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Fig. 1 — Panels a and b reveal the protein banding patterns of the sucrose gradient bands (lanes marked B1, B2, B3, B4) and pellet (lane marked P) which were obtained by sucrose density gradient centrifugation and subjected to SDS-PAGE. Note, that a and b show the results obtained from two independent experiments. In the experiment shown in a, three sucrose gradient bands were obtained, whereas four bands were registered in the experiment shown in b. The sucrose gradient bands B2, B3, and B4 show exclusively a protein band of 25 kDa. In panel c, the western blots of a pooled proteorhodopsin fraction which had been stained with Ponceau S (lane 1) or immunodecorated either with the preimmune serum (lane 2) or the antiserum directed against the pooled proteorhodopsin fraction (lane 3) are shown. The antiserum labeled proteins of 25 kDa. The relative molecular weights of the marker proteins (kDa) are indicated on the left in a, b, and c. For better display of the bands, the digitized pictures were adjusted for brightness and contrast