This species corresponds to the 45 peak when quantifying it using IRMS. Polarization is transferred onto this species to determine its chemical identity in a technique called DEPT. This is the lighter (-5[1])of two species whose concentration is diluted in the Suess effect. The use of this isotope's concentration to detect (-5[1])synthetic testosterone, adulterated food, and infer prehistoric diets comes from its different isotopic signatures in C3 and C4 (*) photosynthesis. Chemical shifts between 0 and 220 ppm are detected in a form of NMR using this isotope, the second most-common form after proton NMR. This stable isotope's natural ratio is 1.1%, and has one fewer neutron than a radioactive isotope with a half-life of 5700 years. For 10 points, name this isotope of Carbon (10[1])that has seven neutrons. (10[1])■END■