Diagrammatic representation of Group 8 features among eukaryotes. Light grey boxes represent small ORFs/uORFs, four perfectly conserved cysteine residues are shown as 'C', and numbers within triangles represent the number of amino acids between the immediately preceding cysteine and an intron. Brackets surrounding fungal introns represent the variable nature of the intron position and/or presence. White boxes show mORFs directly downstream of the uORFs in a given lineage. Presence of a polyA tail is likely to occur in vertebrates (pA; see Results). Question marks indicate mORFs could be present, but insufficient EST sequence is available to infer this feature reliably.