The text of the Review by Donald W. Hilgemann had three errors. In the section entitled "PIP₂: Gregarious But Not Promiscous", a phrase in the third paragraph was unclear and corrected to read the following: "PIP₂ is a trivalent ion at pH7. On the basis of electrostatic interactions alone, it will bind to polyvalent cationic sites with about 100-times higher affinity than monovalent phospholipids will bind to the same sites."

Additionally, references 29 and 30 were incorrect and have been updated to the following:

29. D. W. Hilgemann, A. Collins, The mechanism of sodium-calcium exchange stimulation by ATP in giant cardiac membrane patches: Possible role of aminophospholipid translocase. J. Physiol. 454, 59-82 (1992).

30. D. W. Hilgemann, R. Ball, Regulation of cardiac Na⁺,Ca²⁺ exchange and K_ATP potassium channels by PIP₂. Science 273, 956-959 (1996).

The online display has been corrected. A corrected PDF is available starting January 22, 2002 from http://stke.sciencemag.org/cgi/reprint/OC_sigtrans;2001/111/re19