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.

13 December 1998:

In the fourth (last) paragraph of the Methods section, "2/degrees/minute" was changed to "2 °C/min".

17 December 1998:

In Table 1, "0.016" was changed to "0.16" mg palmitic acid for rhodopsin. In the Abstract, second paragraph of Methods, first paragraph of Results and Figure 2 caption, "Western" was changed to "western".