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Vitamin B12 is an essential vitamin

Precise needle size selection forms the foundation of medical safety, patient comfort assurance, and treatment efficacy optimization

Abbreviations BBB: Blood brain barrier BSP: Bisulfite sequencing PCR CNS: Central nervous system COVID-19: Coronavirus disease 2019 CpG: Cytosine-phosphate-guanine DML: Differentially methylated locus HCY: Homocysteine MS: Multiple sclerosis PET-CT: Positron emission tomography - computed tomography ROCF: Rey-Osterrieth complex figure ROS: Reactive oxygen species RT-qPCR: Real time quantitative polymerase chain reaction SARS-CoV-2: Severe acute respiratory syndrome coronavirus 2 TF: Transcription factor TFBS: Transcription factor binding site VCD: Visuoconstructive deficiency WHO: World Health Organization References Centers for Disease Control and Prevention (CDC)

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