While the level of Mcl1 was found to be significantly lower (p < 0.0001) in AD (19.51 ± 3.44) as compared to MCI (23.10 ± 1.26) and GC (25.74 ± 2.00) (Figure 1A,B), the concentration of Cdk5 (ng/μL) and Mcl1 (ng/μL) in serum with different attributes is illustrated in Supplementary Tables S2 and S3. Here, CDK5 is linked to Alzheimer disease.