Fig 1.

IgM immunoblot analysis with paired mother and newborn sera from an infant congenitally infected with Toxoplasma gondii. Arrows show the IgM triplet defined by the association of 3 equidistant bands at 75, 90, and 100 kDa. (Left panel) The 90- and 100-kDa bands in the blot of the infant's serum were not present in the corresponding blot of the mother's serum. These supplementary bands were associated with the 75-kDa band in the IgM triplet. Other supplementary bands are present in low- and medium-molecular-mass bands in the blot of this infant's serum. (Right panel) Higher-magnification image from blot on the left highlighting the IgM triplet. m, mother; i, infant.