The typographical corrections below were made to the article on the date noted. These changes have been incorporated in the article and the details are documented here.

30 October 1997:

In paragraph 2 of the "Results & Discussion" section:

...(255 ml KH₂PO₄, 20 ml tissue sample, 15 ml BSA and 10 ml ³H-retinol).

was corrected to:

...(255 µl KH₂PO₄, 20 µl tissue sample, 15 µl BSA and 10 µl ³H-retinol).

Paragraph 1 of Figure 5:

Each assay included 20 ml RPE-enriched tissue from 15 animals at the indicated age, 10 ml ³H-retinol, 15 ml BSA. The reaction was terminated after 10 min.

was corrected to:

Each assay included 20 µl RPE-enriched tissue from 15 animals at the indicated age, 10 µl ³H-retinol, 15 µl BSA. The reaction was terminated after 10 min.