51.0 MB (4.4 MB compressed)
3681 x 4843 pixels
31.2 x 40.9 cm ⏐ 12.3 x 16.1 in (300dpi)
ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Computer graphics image of antibodies moving along an artery. Antibodies, special blood proteins, are synthesised in lymphoid tissue in response to the presence of a particular antigen (foreign sub- stance) and circulated in the blood plasma to the troubled site. A huge range of antibodies is produced, each with some slight structural difference enabling it to bind to the surface of a different antigen. The antibodies thus act as flexible adaptor molecules, so that a wide range of infectious agents may be recognised. Here, the arms of the 'Y' shape form the antigen binding portion (Fab), the rest is the Fc portion; this binds to Fc receptors on host tissue cells.
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