TABLE 1.

Comparison of FB₁ production by wild-type and zfr1Δ, and zfr1Δ-ZFR1 mutant strains on DL medium^a

Strain	Mycelial massb	FB1c
Wild type	1.36 ± 0.20	120 ± 10
zfr1Δ	1.38 ± 0.18	NDd
zfr1Δ-ZFR1	1.30 ± 0.22	110 ± 20

^aFB₁ was extracted from cultures grown for 14 days on DL medium (pH 5.6).

^bDry weight (grams) of fungal tissue after vacuum filtration is shown. Each value represents the mean of three replicates ± the standard error.

^cMicrograms of FB₁ per milliliter. Each value represents the mean of three replicates ± the standard error.

^dND, none detected.