Compliance with mandatory publisher requirements is excellent (96%, Figure ). However, we view this in the context that low 'FAIR' data standards are mandated by journals. Compliance with policies that merely recommend a higher standard of data sharing is very poor, authors of only 8 manuscripts shared primary data that was not mandated. Excluding crystallographic data, authors of only 45 manuscripts, less than 20% of those analysed, shared any primary data at all, and of those only 16 manuscripts had shared primary data in a native format outside of a PDF file. The authors of just one manuscript shared any kind of code that would enable another researcher to verify the research outcomes or apply methods to their own data. Our results suggest that journals have a clear role to play in promoting data sharing and FAIR practice. Ideally, compulsory data sharing policies will include guidance on the use of repositories and file formats to agreed common standards.