Fig 2. Body weight, tracer verification and tissue weight.

(A) Mean bodyweight (g) from day 0–472 in male (triangle) and female rats (circle), (B) Tracer enrichment (%) in amino acids collected from serum samples from injected rats at three hours after the first tracer injection for that specific tracer/age (blood sampling +3h), and at one day after the fourth injection and immediately prior to the last/fifth injection (blood sampling +4d) and at a later day: (+22d, +27d, +7d) after the first injection for tracer rats. +3h for Pup-Phe is not measured (X). Values are represented as mean ± 95% CI, (C-D). Relative tissue weight of the soleus muscle, patellar tendon and the eye lens from day 32–472 in male (C) and female (D) rats (% of day 100) (n = 1, except n = 5 for day 100) normalized to day 100.