RSAT 2018: regulatory sequence analysis tools 20th anniversary. - Nga Thi Thuy Nguyen; Bruno Contreras-Moreira; Jaime Abraham Castro-Mondragón; Walter Santana-Garcia; Raul Ossio; Carla Daniela Robles-Espinoza; Mathieu Bahin; Samuel Collombet; Pierre Vincens; Denis Thieffry; Jacques van Helden; Alejandra Medina-Rivera; et al. (Nucleic Acids Res., 2018)