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Fig. 3. Actin foci disappeared about 20 seconds after their appearance. (A) Time course of fluorescence intensity of the three actin foci shown in Fig. 2I. (B) Frequency distribution of the duration of actin foci in wild-type cells. The average±s.d. from 164 foci in 24 cells was 19.43±8.16 seconds. (C) Frequency distribution of the duration of actin foci in MHC-null cells. The average±s.d. from 192 foci in 14 cells was 20.26±7.39 seconds.