Gene organization of the TOX2 genes in C. carbonum and A. jesenskae . (A) The known organization of the TOX2 locus in C. carbonum SB111 [8, 9]. H = HTS1. (B) the organization of TOXA and HTS1 in C. carbonum. (C) The organization of TOXA and HTS1 in A. jesenskae. (D) The organization of TOXD, TOXF, and TOXG in C. carbonum. (E) The organization of TOXD, TOXF, and TOXG in A. jesenskae. Arrows indicate directions of transcription, except in (A) where the arrows are omitted for clarity; see ref. .