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Relationship of frequency to diameter for VAF collected from rocks at White Point vents (water depth, ca. 6 m). Filaments less than 10 μm in diameter (white bars) did not hybridize with any fluorescent probe, including WPF464, while all wider, attached filaments (black bars) positively hybridized with WPF464. Suspensions were collected in July 2001 (A) and February 2002 (B).
