The NIH’s ORWH has added its Sex As a Biological Variable page back (though it has a “historical page” disclaimer on it). It’s clean, clear and correct. The associated PDF guidelines have also been corrected.
https://orwh.od.nih.gov/sites/orwh/files/docs/NOT-OD-15-102_Guidance_508.pdf
Example paragraph:
Definitions of sex and gender. Research findings may be influenced by sex and/or gender, and it is important to use these terms appropriately. Women and men are characterized by both sex and gender, as highlighted in the Institute of Medicine report entitled Exploring the Biological Contributions to Human Health: Does Sex Matter? (2001).4 Sex is a biological variable defined by characteristics encoded in DNA, such as reproductive organs and other physiological and functional characteristics. Gender refers to social, cultural, and psychological traits linked to human males and females through social context. In most cases, the term “sex” should be used when referring to animals. Both sex and gender and their interactions can influence molecular and cellular processes, clinical characteristics, as well as health and disease outcomes.
I thought I would never see this happen. This is cause for immense celebration.