Fig. 2From: The serine/threonine kinase 33 is present and expressed in palaeognath birds but has become a unitary pseudogene in neognaths about 100 million years agoAmino acid sequence alignment of the STK33 catalytic domains from different species. Percentage of sequence identities corresponding to the catalytic domain are shown next to the corresponding sequences. The ATP binding site is framed by a green rectangle and the active site by a blue rectangle. Mismatches are emphasized in redBack to article page