NRGN and oculocutaneous albinism type 1: Our sample with data on CSF NfL and Ng concentrations comprised 258 cognitively unimpaired participants who were distributed among the ATN groups as follows: A−T−N−: 138 (53.5%), A−T−N+: 49 (19.0) A−T+N+: 12 (4.7%) A+T−N−: 33 (12.8 %) A+T−N+: 20 (7.8%) A+T+N+: 6 (2.3%), while there were no participants with A−T+N− and A+T+N− [16, 31]..