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The ultrastructure of brown adipose tissue (BAT), the thermogenic type of adipose tissue, was investigated in biopsies from 4 pre-term human new-borns delivered at 25–27 week's gestational age and compared with peri-renal brown fat from 2 adult patients with phaeochromocytoma (a condition of...
The imaginal antenna of the male silkmoth Antheraea polyphemus is a feather-shaped structure consisting of about 30 flagellomeres, each of which gives off two pairs of side branches. During the pupal stage (lasting for 3 weeks), the antenna develops from a leaf-shaped, flattened epidermal sac...
T lymphocytes interact at various levels of differentiation, with cells of the thymic reticulum, forming a peculiar and complex microenvironment. Following earlier descriptions by electron microscopy of three types of epithelial cells and two types of non-epithelial cells (macrophages and...
Researchers have previously demonstrated that organotypic cultures of cervical tumor cell lines exhibit morphological characteristics similar to the in vivo biopsies from which they were derived (Rader et al., 1990). Both the in vivo biopsy and organotypic culture appeared undifferentiated. We...
Xenopus laevis embryos injected with follistatin developed abnormally with enlarged anterior structures and defective tails. Histological sections reveal that these follistatin treated embryos contain large amount of notochordal tissue that fails to elongate. Embryonic responses to follistatin...
Nephrocytes are cells involved in the metabolism of hemolymph components and are characterized by peripheral finger-like projections bordering a labyrinthine channel system. The antibacterial protein lysozyme was localized in anterior and pericardial nephrocytes of the harvestman, Leiobunum...
Pro-opiomelanocortin (POMC)-derived peptide (adrenocorticotropic hormone (ACTH), β-endorphin, α-melanocyte-stimulating hormone (MSH))- and cytokine (IL-1α, IL-1β, IL-2, IL-6, TNF-α)-like molecules were demonstrated in PAS positive epithelial cells of the thymus of the anuran amphibian Rana...
Using a monoclonal antibody (GT 335) we previously demonstrated that glutamylation is a predominant posttranslational modification of α and β tubulin isoforms in the axoneme of mouse spermatozoa (Fouquet et al., Cell Motil. Cytoskel. 27, 49, 1994). However, we noted that the staining intensity...
Human sperm flagella were analyzed by electron microscopy and computer averaging in order to characterize normal flagella and to detect differences between normal and mutated spermatozoa. The A-tubules of normal spermatozoa were seen to have 13 protofilaments and a lumen containing a...
The stomach of developing embryos was examined by light and electron microscopy on specimens taken at each embryonic day from 11 to 17 (rat) and from 10 to 16 (mouse). The aim of the study was to determine when the precursor cells of enteric neurons and endocrine cells colonize the stomach and...
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