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Absorbance spectra of heptane extracts of Botryococcus braunii var. Showa (a and c), and Botryococcus braunii Kawaguchi-1 (b and d) micro-colonies. Absorbance of extracts in the blue (380–520 nm) region of the spectrum (a and b) are attributed to extracellular carotenoids from the two strains. Absorbance of extracts in the far UV (190–220 nm) region of the spectrum (c and d) are attributed to extracellular botryococcenes from the two strains, respectively
