PRIME-XS user projects could be considered collaborative when the input from the access site is expected to extend beyond the simple measurement of samples (for example when the access site is involved extensively in the experimental design or scientific interpretation or when the access site is asked to contribute to the preparation of a resulting manuscript beyond just supplying a materials and methods section). In such cases selected scientific personnel from the access site where the work was performed could be considered to be included as co-authors on a resulting manuscript.