In the paper by Kacser and Burns (Genetics 97: 639-666) entitled, "The molecular basis of dominance," equations (1) and (2) on pages 646 and 647 should read:

(see PDF)

and

(see PDF)

(See also Kacser and Burns 1973.)

Equations (1a) and (2a) remain unaffected by these transcription mistakes.