Sex-related size polymorphism of amelogenin fragment in Cetacean. (Molecular weight markers is Biolabs' 1 kb + ladder): a) Agarose gel showing differences between male amplification in a Baleen (toothless) whale (left of the ladder) and Toothed whales (on the right). b) Agarose gel showing differences between males and females in Striped dolphin. 1,000 bp band for Amel-Y, 500 bp band for Amel-X. Each lane represents a single sample (#1 to 5). Symbols ♂ and ♀ are for male and female samples respectively.