Fig. 4

P. margaritifera samples: 1) Juvenile stage (J dataset) with albino phenotype (N = 5) and black wild-type phenotype (N = 5), 2) Mantle tissue (M dataset) and 3) pearl sac (PS dataset). For M and PS, the picture shows a black-shelled wild-type example. All pictures were made by the corresponding author C.-L. Ky, with its permission for publication in this journal