Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(a) SERS Calibration plots for MMP-7 and CA 19-9 antigen spiked into 1:4 pooled human serum:PBS buffer. Each point represents the average of 5 measurements and error bars are ± 1 standard deviation. In some cases, the error bars are smaller than the data point. (b) ELISA Calibration plots for the same MMP-7 and CA 19-9 standards used in (a). Each point represents the average of two measurements. Error bars for these data are ± absolute deviation.
