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Imaging the surface layers of yolk in K. marmoratus embryos. During midsomitogenesis, geometrically shaped skin cells covered the surface of the yolk (i and ii; arrows). Under the epidermal layer, newly formed blood vessels were observed (iii and iv; arrows). The next deeper layer was the YSL where YSN were observed (v and vi; arrows). The deepest layer only contained oil droplets (vii and viii). Scale bar = 50 µm.
