Analysis of the metabolite markers of azathioprine (AZA) and mercaptopurine (6-MP), including 6-methyl-mercaptopurine ribonucleotides (6-MMRP) and 6-thioguanine nucleotides (6-TGN), is considered investigational.
Though the temperature of the inner core of the Earth is about 5700 degrees, (about as hot as the surface of the Sun) the pressure is also very high, about 3.3 - 3.6 million aâ¦tmospheres. At these pressures the material is solid, as has been confirmed in lab tests.
What was thought to be a solid iron core is actually crystalline,  surrounded by liquid. But the temperature at which that crystal can  form had been a subject of long-runniâ¦ng debate. Current  measurements suggest the Earth's inner core is 6,000C - as hot as  the Sun's surface.