Equation 13 In Biochemical Nomenclature and Related Documents, 2nd edition, Portland Press, 1992, page 100 equation 13 has lost its upper horizontal line. It should appear as
Section 6.3 The text should refer to the subscript '0' and not 'o' as appears in all printed versions.
The entry for [Q], concentration of activator Q, has been corrected. All printed versions need correcting. This correction was published in Eur. J. Biochem., 1993, 213, 1