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. 2021 Sep 1;7(36):eabe8215. doi: 10.1126/sciadv.abe8215

Fig. 1. Sex chromosome evolution in the adaptive radiation of cichlid fishes in LT.

Fig. 1.

Sex chromosome state and ancestral state reconstruction in LT cichlids (permissive dataset) are placed on a time-calibrated species tree (17), with background color shading indicating the 13 cichlid tribes of the LT radiation. The inner circle at tips shows identified sex-linked LGs. Colors refer to the LGs of the reference genome [23 LGs in the used reference genome represent the 22 chromosomes of O. niloticus, the most common chromosome number for African cichlids (21)]; two- or multi-colored symbols at tips indicate sex chromosomal signals that were detected on two or more reference LGs, suggesting chromosomal rearrangements between O. niloticus and LT cichlids. Symbols at the outer circle indicate the heterogametic SD system identified in each species (square, XY; triangle, ZW; no symbol, no system has been identified). Empty circles at tips indicate that within the dataset used here, no sex chromosome could be identified, nor has, to the best of our knowledge, genetic SD been investigated in these species elsewhere. Pie charts at nodes represent the probability for an LG being a sex chromosome at this time derived from ancestral state reconstructions.