Fig. 4

Pre-fertilization experiments of sea urchin P. lividus embryos to the total extract (CCLO EXT) and fractions (CCLO 2B, CCLO 2 C, CCLO 2D, CCLO 2E) from C. closterium at the three concentrations: C1 = 0.125 mg/L; C2 = 0.250 mg/L; C3 = 0.500 mg/L.