Introduction -- Health and Safety Considerations -- Sample Collection and Storage -- Low-Cost DNA Extraction -- PCR Amplification for Low-Cost Mutation Discovery -- Enzymatic Mismatch Cleavage and Agarose Gel Evaluation of Samples -- Alternative Enzymology for Mismatch Cleavage for TILLING and Ecotilling: Extraction of Enzymes form Common Weedy Plants -- Example Data -- Conclusions.  .