Maximum-Likelihood trees of ancestral NCLDV genes involved in transcription and RNA processing. A, RNA polymerase alpha subunit. B, RNA polymerase beta subunit. C, A2L transcription factor. D, Transcription initiation factor TFIIB. E, A18-like helicase. F, mRNA capping enzyme. Branches with bootstrap support less than 0.5 were collapsed. For each sequence, the species name abbreviation and the gene identification numbers are indicated; env stands for environmental sequences. Species abbreviations:CroV, C.roenbergensis virus; Moumou, Moumouvirus; OLPV1, Organic Lake phycodnavirus 1; OLPV2, Organic Lake phycodnavirus 2; Phaglob, P. globosa virus; Afrsw, African swine fever virus; CanKo, Candidatus Korarchaeum cryptofilum OPF8; Emihu, Emiliania huxleyi virus 86; Hydma, Hydra magnipapillata. Taxa abbreviations: Ak, Korarchaeota; El, Opisthokonta; c1, Asfarviridae; q2, Coccolithovirus.