Publisher Correction: Label-free fiber-optic spherical tip biosensor to enable picomolar-level detection of CD44 protein

Abstract

The original article contained a duplicated Figure 4 legend. The text "The experimental setup used for the CD44 protein measurements using a fiber optic spherical tip-based biosensor. Surface functionalization steps are shown in the zoomed area. APTMS 3-(aminopropyl)trimethoxysilane, MUA 11-mercaptoundecanoic acid, EDC 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride, NHS N-hydroxysuccinimide, OBR optical backscatter reflectometry." now reads: "Studying specificity of functionalized fiber optic tip biosensor for CD44 protein detection by measuring control proteins (IL-4 and thrombin). The reference protein concentration used was 6 pM. (a) Amplitude change of the sensors when measuring target protein vs. control proteins in different concentrations; (b) Response of the sensors normalized to their respective RI sensitivities."