Comparison of mass spectra from P. insidiosum and non-insidiosum Pythium species. Four mass spectra are generated from P. insidiosum strains inhabited in the same rice field (IDs: KCB02, KCB03, KCB04, and KCB05). One each of the mass spectra is derived from P. insidiosum strain BKDZ02 (from a zoo in Bangkok), P. rhizo-oryzae strain RCB01 (from a pond in Ratchaburi province), and P. catenulatum strain RM9-09 (from a pond in Bangkok). The P. insidiosum strain Pi35 (from a pythiosis patient) is included as a reference organism. The Y-axis shows mass intensity, while the X-axis represents the mass-to-charge ratio (m/z). Asterisks indicate the prominent m/z peaks that share among different strains of P. insidiosum.