Table 2.

Rate constants of fluorescent tracer exchange between vegetative cells in Anabaena and indicated amiC mutant strains used in this work.

	Mean R (s−1) ± SD (n)
Anabaena strain	Calcein	5-CF
PCC 7120	0.090 ± 0.018 (24)	0.120 ± 0.029 (12)
SR477	0.056 ± 0.013 (9)	0.038 ± 0.010 (33)
FQ1633	0.051 ± 0.015 (18)	0.032 ± 0.005 (3)
FQ1633 SR478
(normal filaments)	0.057 ± 0.009 (5)	0.039 ± 0.012 (7)
(aberrant filaments)*	0.000 ± 0.000 (6)	0.000 ± 0.000 (16)
SR477 DR1992	0.047 ± 0.008 (2)	0.051 ± 0.002 (2)

FRAP analysis was performed and evaluated as described in Materials and Methods.

Data are mean ± SD from the results obtained with the number n of filaments subjected to FRAP analysis in parenthesis.

^*39% of cells showed aberrant morphology (see also Table S3).