(A) Pink marbling on the surface of aged cheese rinds is sometimes observed during the cheesemaking process. (A) Pink marbling on the surface of aged cheese.

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(A) Pink marbling on the surface of aged cheese rinds is sometimes observed during the cheesemaking process. (A) Pink marbling on the surface of aged cheese rinds is sometimes observed during the cheesemaking process. It is likely that this pink pigment is produced by microbes growing on the rinds and has remained unidentified. (B) Observations in well plate assays showed that G. arilaitensis (G) produces a pink pigment when grown alongside Penicillium (P). (C and D) Colonies grown on agar plates are shown from top (C) and bottom (D) views. Photos were taken 5 days after inoculation of cheese curd agar. Jessica L. Cleary et al. mSystems 2018; doi:10.1128/mSystems.00036-18