TRPM6 and infection: Somewhat unexpectedly, ΔhmgX did not show the same phenotype as ΔhpdA during macrophage infection, despite the hypothesis that HmgX acts as an accessory protein to HpdA and the ΔhpdA and ΔhmgX strains showing an equivalent growth reduction on tyrosine as a sole nitrogen or carbon source at both 25°C and 37°C and an equivalent lack of pyomelanin production in vitro.