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.
Principal component analysis scores plot comparing Escherichia coli BL21 and BL21‐AmpC strains in the presence and absence of 2 μg ml−1 ampicillin‐supplemented media. 
BL21 (2 μg ml−1 ampicillin), + BL21 (untreated), 
BL21‐AmpC (2 μg ml−1 ampicillin), 
BL21‐AmpC (untreated).
