Joint derived allele counts in samples of Emperor and King penguins

For details refer to Extended Methods and Supplementary Information of: Trucchi E, Massa P, Giannelli F, Fernandes FA, Ancona L, Stenseth NC, Ferrer Obiol J, Paris J, Bertorelle G, Le Bohec C. Gene expression is the main driver of purifying selection in large penguin populations. bioRxiv. 2023:2023-08. Section 1.4 and 1.5