mEGFP(A206K) is a monomeric green fluorescent protein with an excitation peak of 488nm and an emission peak of 507nm in vitro (PMID:18057027). It is an artificial derivative of the naturally occurring fluorescent protein encoded by the Aequorea victoria GFP gene (UniProtKB:P42212), derived by mutagenesis of EGFP, containing the A206K mutation that disrupts dimerization in addition to those present in EGFP.