Sir

Thank you for your excellent Feature, 'Nature's guide for mentors' (Nature 447, 791–797; 2007). It's definitely one of the best things I've read in Nature in the 25 years I've been reading the journal. To better help students make informed choices about choosing a mentor, it would be enormously useful if public granting agencies such as the US National Institutes of Health would publicly post the 'trainees' lists that are included in training grants for every faculty member in a given PhD training programme. If this were done, students considering applying to those labs would know their actual chance of being mentored successfully.