(Table 3) Approximate composition of tetrapyrrole pigment isolates at DSDP Leg 57 Holes

Values are normalized, using absorption values at chlorin red maxima. Equal extinction of chlorin species is assumed, ind. = indicated from spectra of mixtures; +, ++ = present, relative downhole relationship; # = positive reaction with borohydride ethanol. Only selected isolates were tested for carbonyl functions.