New drugs and higher yields of microbial metabolites continue to be discovered by utilizing mutation and genetic variation breeding techniques in drug-producing organisms.
The claim is specific and empirical: whether new drugs or drug yields are discovered by inducing mutations in drug-producing organisms. Papers 6 and 8 explicitly discuss mutation breeding, mutagenesis technologies (such as ARTP and HEPE), and their role in activating cryptic metabolites and enhancing microbial strain improvement for drug discovery. Therefore, the claim is supported by the literature.