Very long chain polyunsaturated fatty acids (VLCPUFAs) are important components of ceramides and sphingomyelin and are present in retina, sperm, and brain. Tetratriaconta-16(Z),19(Z),22(Z),25(Z),28(Z),31(Z)-hexaenoic acid is a C34:6 VLCPUFA whose specific biological actions are largely unknown. This VLCPUFA, along...

Ascomycin, produced by the fermentation of S. hygroscopicus subsp. ascomyceticus, is an ethyl analog of tacrolimus (FK-506) with potent immunosuppressant properties that prevents T-cell proliferation through initial binding to FK-506-binding protein 12 (FKBP12), an immunophilin that acts as the principal mediator of...