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Fig. 2 | EvoDevo

Fig. 2

From: Developmental expression of “germline”- and “sex determination”-related genes in the ctenophore Mnemiopsis leidyi

Fig. 2

Expression of nanos, vasa and piwi homologs during Mnemiopsis development. All views are lateral, unless otherwise specified, with the asterisk marking the position of the blastopore or mouth. (Top row) MlNanos1 was expressed uniformly in the egg and through cleavage stages and blastulae (0–2 hpf). From gastrulation (4 hpf) onward, expression was confined to the developing comb plates and pharynx. In later stages (10–12 hpf), there was also additional expression in the tentacle bulbs. (Middle row) MlVasa1 was not detected until after gastrulation, at 7–9 hpf. It was expressed in the blastopore and eventually the pharynx. MlVasa1 was also expressed in the ectoderm along the sagittal axis. Additionally, it was expressed in mesodermal derivatives. In later stages (10–12 hpf), expression was detected in the pharynx, tentacle bulbs and in the ectoderm between the comb rows. (Bottom row) MlPiwi1 is expressed uniformly in the egg. At gastrulation, it was downregulated except for the invaginating pharynx, mesodermal derivatives and four other groups of cells. In later stages, it remained expressed in the pharynx, tentacle bulb and the muscle that connects the two tentacle bulbs

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