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A number of items in this article were printed incorrectly. Corrections appear as follows:
Fig. 1 legend: 
Ghydrolysis 
–22 kT.
Table 1: Units of Kp should be in mM. [MD](–)-crit should be defined as "MD addition to minus ends" for both actin and tubulin.
Table 2: For mechanism-B, the equilibrium dissociation constants should be primed, appearing as K'1 K'2/K'3.
Page 2481, left-hand column: Units of 
should be "pN-nm".
Page 2849: Units of persistent length should be "µm".
Equation in Fig. 4 legend should read: K'2 = K'2,0eFd/2kT.
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should be defined as the probability of the end-tracking unit being bound to the penultimate subunit, is and (1 – ) the probability of it being bound to the terminal subunit. should be correspondingly defined as such for Mechanism-A in Table 3.
Omissions in legends for Figs. 3 and 4: Dashed lines represent the free-filament elongation model (Eq. 11) with [MT] = 0.3 µM and [MT](+)-crit = 0.1 µM. The value 
= 1 was used for calculations in Fig. 4. The units of K'1 are µM.
Mechanism-B, kinetic Eqs. 12 and 13: Because only one tracking unit was assumed to operate per subfilament, the states represented by probabilities u and are mutually exclusive; therefore, the factors of (1 – ) appearing in the second-order terms in Eqs. 12 and 13 should not have been included. The corrected equations are:
 | (12) |
 | (13) |
These equations, now allow linear in u and , yield an analytical solution for the elongation rate, R, which is replotted here as a replacement to Fig. 4 (below). The differences with the original results in Fig. 4 are minor and in no way affect the conclusions of the article.
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