1 Cerebrospinal fluid Aβ42 and fractalkine are associated with Parkinson’s disease with freezing of gait J. M. Hatcher-Martin, MD 1,2* , J.L. McKay, PhD 1,3,4* , B. Sommerfeld, NP 1 , J.C. Howell, BS 5 , F. C. Goldstein, PhD 5 , W.T. Hu, MD, PhD 6 , S.A. Factor, DO 1* 1 Jean & Paul Amos PD & Movement Disorders Program, Department of Neurology, Emory University 2 Department of Neurology, SOC Telemed (current affiliation) 3 Department of Biomedical Informatics, Emory University 4 Wallace H. Coulter Department of Biomedical Engineering, Georgia Tech and Emory University 5 Neuropsychology Program, Department of Neurology, Emory University 6 Alzheimer’s Disease Research Center, Emory University and Cognitive Neurology Division Rutgers, the State University of New Jersey * These authors contributed equally to the manuscript. Word count 2,938 Abstract word count: 231 Title character count (with spaces): 72 Reference number: 47 . CC-BY-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. (which was not certified by peer review) preprint The copyright holder for this this version posted December 18, 2020. ; https://doi.org/10.1101/2020.12.16.20248342 doi: medRxiv preprint NOTE: This preprint reports new research that has not been certified by peer review and should not be used to guide clinical practice.