Fig. 1.

Size and GC content in the candidate mating-type chromosomes (candidate mating-type locus positions as in supplementary table S1, Supplementary Material online) in the eight Mamiellales genomes. Sequences of CH02 of Ostreococcus lucimarinus and Micromonas pusilla have been reversed complemented to take colinearity of flanking regions as described in Palenik et al. (2007) and Worden et al. (2009) into account. Node divergence estimations are from Šlapeta et al. (2006) for Micromonas and Parfrey et al. (2011) for the basal node.