This may be a silly question but, I am wondering if it is possible to parcellate functional data into an atlas in MNI space without having anatomical data to co-register the functional data to. Due to data-sharing issues, I have access only to preprocessed functional data. Is there a way to correctly align the atlas (in MNI space) and the functional data (in original subject space) without coregistering the functional scans to anatomical scans?