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Figure 6


Fig. 6. Dendraster excentricus; artificial egg masses. (A) Representative high- and low-embryo density artificial egg masses, constructed by casting newly fertilized D. excentricus into low-melting point agarose. Both masses are `medium diameter' masses, ~4 mm in diameter. (B) Radial profiles of oxygen through artificial masses of small, medium and large diameter, obtained using a Clark-style microelectrode. Arrows indicate position of midpoint.