This follicular adenoma of the thyroid is shown in a right lobectomy specimen, sectioned vertically and viewed from the posterior aspect to show a 2.7 cm tumor distending the lower pole.
Ribbon diagram of a heptameric, 63 kDa cleavage fragment (PA63) of the protective antigen (PA) protein, produced by Bacillus anthracis as part of the anthrax toxin. The quaternary structure is that of a pre-pore, which later forms a channel that allows other toxins into the cytosol of the target cell, so the pathogen can cause damage to the host.
Sequence alignment of 27 H9N2 avian influenzahemagglutinin protein sequences. The top section is colored by residue conservation and the bottom by residue chemical properties. Alignment produced with ClustalW.
The left hip of this dog (on the right side of the X-ray) has an artificial hip. The right hip has hip dysplasia with osteoarthritis and remodeling of the head of the femur.
Animation created from a functional magnetic resonance imaging scan (fMRI) of the brain. The little dot that appears on the upper-left hand side outside the skull is a vitamin Epill taped to the side of the head for correct left-right orientation.
Vesalius' De humani corporis fabrica, plate 164. Original scanned page from 1543 edition. Plate 164 is described as "Drawing of the Bones of the Human Body, Seen from the Side".
The sinoatrial node (abbreviated SA node or SAN, also called the sinus node) is the impulse generating (pacemaker) tissue located in the right atrium of the heart.
Scanning electron micrograph of HIV-1 budding from cultured lymphocyte. Multiple round bumps on cell surface represent sites of assembly and budding of virions.