Mass spectrum of a product formed by chicken HNMT-like protein.

<p>Homogenous recombinant chicken HNMT-like protein was incubated for 12 h with 3 mM carnosine in the absence or presence of 2 mM SAM. The produced methylated dipeptide was separated from the substrates and analyzed by mass spectrometry. Both mass spectra, covering the mass range <i>m/z</i> 50–600, and tandem mass spectra (Q-TOF) for anserine precursor ion (<i>m/z</i> 241) were acquired.