To address the chemical <a href="http://www.agar-bacteriological.com/cells-and-plasmids-huh-cells-were-obtained-from.html">SNDX-275</a> of OPH in HOOC–FMS, the conformational changes of OPH was further studied by measuring fluorescence spectra of its Trp residues in the presence of urea (Fig. 2). T