claim: There is a musician called John Frusciante.
evidence: Methylenomycin A is a cyclopentanoid antibiotic produced by Streptomyces coelicolor A3 -LRB- 2 -RRB- that is effective against both Gram-negative and Gram-positive bacteria .. Streptomyces coelicolor. Streptomyces coelicolor. Gram-negative. Gram-negative. Gram-positive. Gram-positive. Methylenomycins are naturally produced in two variants  : A and B.