The inclusion of a gender/sex perspective in the literature analysis ensures the integration of the concepts of sex and gender in relation to data, methods, results, and objectives, through comparison, rupture or continuity with respect to previous works. An analysis of the literature should explain whether, and to what extent, sources quoted adopted a gender/sex perspective (including animals, tissues, and cells), both from the point of view of research design and from the impact or implications of the research itself. It should be highlighted in which aspect of the research gender and/or sex were integrated. If there is no source adopting a gender/sex perspective, the author should try to make the gap explicit and discuss it.