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Neighbor-joining tree of α-enolase alleles for least (L) and crested (C) auklets, based on Jukes-Cantor distances. Allelic lineages present prior to the speciation event (n = 7) are those that cross the vertical line indicated in boldface type (which marks the estimated divergence time of lineages leading to modern least and crested auklets). L12 and C13 are identical, as are C1 and L3.
