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Front cover illustration

Depending on the genotype and/or growth conditions, Yarrowia lipolytica forms a wide variety of colony morphologies. Whereas wild-type strain colonies (right-hand corners) exhibit ‘brain-like’ shapes on media containing various carbon sources, colonies of a mutant strain lacking the YlBAS1 gene, encoding a putative transcription factor, adopt various forms, including ‘breast-like’ colonies shown in the middle panel. Images courtesy Slavomir Kinsky and Lubomir Tomaska, Comenius University, Department of Genetics, Bratislava, Slovakia.