Fig. 1. Intracellular free-pool (FPSR) and protein-bound (SR) specific radioactivities in Nacella concinna at Rothera Research Station, Adelaide Island, Antarctica. (A) Summer intracellular free-pool (y=1037–0.9092x, r²=44.4%, P<0.01). Letter A signifies data points that are significantly different to each other. (B) Winter intracellular free-pool. (C) Summer protein incorporated (y=–0.175+0.00538x; r²=0.67). (D) Winter protein incorporated (y=–0.134+0.005x; r²=0.67). All values are mean ± s.e.m. Each data point represents values from five (summer, 1 and 2 h; winter, 1 h time course) or six animals (summer, 4 h; winter, 2 and 4 h time course). Fitted regression lines were highly significant (P<0.001) with intercepts not significantly different to zero.