Figure 4

Principal component analysis of T3Aug3 vs. CKAug3 in positive (a) and negative (c) ion modes, T3End vs. CKEnd in positive (b) and negative (d) ion modes. T3Aug3 (samples from the T3 treatment on August 3rd), CKAug3 (samples from the CK treatment on August 3rd), T3End (samples from the T3 treatment on September 2nd) and CKEnd (samples from the CK treatment on September 2nd).