Expanded region of the MALDI-TOF MS spectrum of the COOH-terminal NP domain (aa 439 to 739) acquired in linear positive ion mode. The m/z values of 36,036 and 35,838 are consistent with the expected molecular weight of the polypeptide with or without the N-terminal two amino acids, respectively (theoretical 36,051 Da and also 35,849 Da). The “+/−” numbers correspond to the calculated standard deviations (n = 7).