Issue, M. Vol.51 - 2 - 2019: Cover: Micrograph Showing Fluorescent Merocyanine Patterns on Dog Spermatozoa: Opaque - Low Fluidity (spermatozoon on the Left) or Brilliant - High Fluidity (spermatozoa on the right). Photograph Captured by Alicia Alcantar-Rodríguez and Provided by Ortega-Morales Et Al. Austral J Vet Sci 2021, 51, 45-104.