An extracellular region part that consists of a protective layer of mucus secreted by epithelial cells lining tubular organs of the body such as the colon or secreted into fluids such as saliva. Mucus is a viscous slimy secretion consisting of mucins (i.e. highly glycosylated mucin proteins) and various inorganic salts dissolved in water, with suspended epithelial cells and leukocytes.
myelin sheath +
myelin sheath abaxonal region
myelin sheath adaxonal region
myofilament +
neck portion of tanycyte
neuron projection branch point +
neuron projection terminus +
nexine
node of Ranvier
nuclear body +
nuclear envelope adjacent to nuclear pore complex
nuclear lamina +
nuclear matrix
nuclear periphery +
nucleoid +
nucleoplasm +
nucleoplasmic periphery of the nuclear pore complex
nucleoplasmic reticulum
nucleoplasmic side of nuclear pore
nucleus lagging edge
nucleus leading edge
oral apparatus +
organellar chromatophore intermembrane space
organelle +
organelle envelope +
organelle membrane contact site +
organelle subcompartment +
organelle-enclosing lipid monolayer +
orthogonal array
other organism part +
outer dense plaque of desmosome
outer plaque of spindle pole body +
pairing center
paranode region of axon
pectic matrix
pellicle +
perforation plate
peribacteroid fluid
pericellular basket
pericentriolar material
perichromatin fibrils
perikaryon
perinuclear endoplasmic reticulum +
perinuclear region of cytoplasm +
perinucleolar compartment
periphagosomal region of cytoplasm
peripheral region of growth cone +
periplasmic space +
perisynaptic space
perivitelline space
phagocytic cup +
phagocytic cup base
phagocytic cup lip
phagophore
phagophore assembly site +
photoreceptor distal connecting cilium
photoreceptor inner segment +
photoreceptor outer segment +
photoreceptor proximal connecting cilium
phragmoplast
phragmosome
pilus shaft
pilus tip
pinceau fiber
pituitary gonadotropin complex +
plasma membrane-derived chromatophore +
plasmodesmatal cytoplasmic sleeve
plasmodesmatal desmotubule +
plasmodesmatal plasma membrane
plastid stroma +
plastoglobule
podosome core
podosome ring
polar ring of apical complex
polar tube
polar tube anchoring disc
pollen aperture
polytene chromosome ectopic fiber
polytene chromosome weak point
porosome
post-anaphase microtubule array +
postsynapse +
postsynaptic endocytic zone +
preprophase band
presynapse +
presynaptic active zone +
presynaptic active zone dense projection
presynaptic endocytic zone +
presynaptic grid
procentriole
prospore membrane spindle pole body attachment site
proximal portion of axoneme
rDNA protrusion
recombination nodule +
replication fork +
reservosome lumen
reservosome matrix
reservosome membrane
retrotransposon nucleocapsid
rhoptry +
rhoptry neck
right lateral basal body pair
right middle basal body pair
right tetrad
ring centriole
rough endoplasmic reticulum cisterna
sarcomere +
satellite fibril
Schmidt-Lanterman incisure
scintillon
sculpture element
septin band +
sexine +
side of membrane +
sieve area
sieve plate +
site of DNA damage +
site of polarized growth +
smooth endoplasmic reticulum cisterna +
smooth muscle dense body
somatodendritic compartment +
sperm annulus
sperm end piece
sperm fibrous sheath
sperm head +
sperm head-tail coupling apparatus
sperm individualization complex +
sperm midpiece +
sperm mitochondrial sheath
sperm principal piece
spindle matrix
spindle midzone +
spindle pole +
spine mat
spongiome
starch grain +
stereocilia coupling link +
stereocilia tip-link density +
stereocilium base
stereocilium shaft
stereocilium tip
striated muscle dense body
stromule
subapical part of cell
suberin network
subpellicular network
subplasmalemmal coating
supramolecular complex +
surface coat of collagen and cuticulin-based cuticle extracellular matrix