apical complex

ap·i·cal com·plex

a set of anterior structures that characterize one or several developmental stages of members of the protozoan phylum Apicomplexa; includes the following structures, visible by electron microscopy: polar ring, conoid, rhoptries, micronemes, and subpellicular tubules.
References in periodicals archive ?
Smythe et al., "Integral membrane protein located in the apical complex of Plasmodium falciparum," Molecular and Cellular Biology, vol.
They found that two proteins within the apical complex, Pals1 and Pten, were interacting with the Igf1 receptors in the stem cells, relocating the receptors to the boundary between the stem cells and the CSF.
A better understanding of the Igf2 signaling pathway, the stem cell's apical complex proteins that interact with it, and the temporally-driven changes in the CSF could lead to increased understanding of some brain tumors, including glioblastoma.
They found that two proteins within the apical complex, Palsl and Pten, were interacting with the Igf1 receptors in the stem cells, relocating the receptors to the boundary between the stem cells and the CSF.
"When we deleted Palsl in mice, we disrupted the normal assembly of the apical complexes, which then led to loss of polarity in the stem cells," said Maria Lehtinen, Ph.D., in Walsh's laboratory, one of the study's first authors.
The apical ganglion (AG) of molluscs (Leise, 1996; Lin and Leise, 1996a, b; Marois and Carew, 1997a, b) is also known by a variety of other names, e.g., apical sense organ (Conklin, 1897), apical organ (Pelseener, 1911; Werner, 1955; Tardy, 1974; Page, 1992), cephalic sensory organ (Bonar, 1978; Uthe, 1995), apical sensory organ (Chia and Koss, 1984; Kempf et al., 1997), and apical complex (Tardy and Dongard, 1993).
Chelicerae dorsal.--All species possessed the apical complex ChDA.
Abbreviation Chaetotaxic complex Chelicerae [Ch.sub.DA] dorsal apical complex [Ch.sub.DM] dorsal median complex [Ch.sub.VAM] ventral apico-median complex [Ch.sub.VM] ventral median complex Tarsi I and II [T.sub.DA] dorsal apical complex [T.sub.DAI], [T.sub.DAII ...] first, second, ...
They found that two proteins within the apical complex, Palsl and Pten, were interacting with the Igfl receptors in the stem cells, relocating the receptors to the boundary between the stem cells and the CSF.
From the 6-armed stage onwards the apical complex begins to increase dramatically in both size and complexity, whereas the lower lip complex expands no further.