[Sacrococcygeal extraspinal myxopapillary ependymoma].

A 9-year-old boy was admitted with a circumscript subcutaneous tumor of the sacral region. Serum alpha-fetoprotein was not elevated. The lesion was excised en bloc including the top of the coccygis.

Identification of a subpopulation of merozoites of Sarcocystis singaporensis that invades and partially develops inside muscle cells in vitro.

The affinity of merozoites of Sarcocystis singaporensis obtained from the lungs of acutely infected rats to muscle cells and other cell lines grown in vitro was examined. Two distinct types of mature schizonts developed in the lungs 11-13 days p.i.

Sarcosporidiasis in rodents from Thailand.

One to six Sarcocystis spp. were identified in the skeletal muscles of 41 (33%) of 124 wild rodents (Rattus spp. and Bandicota indica) mainly captured in the central plains of Thailand throughout the year in 1995.

NADPH-diaphorase reactivity in the Mauthner cells of the swordtail fish, Xiphophorus helleri.

The presence of nicotinamide adenine dinucleotide phosphate-diaphorase (NADPHDH) in fixed tissue was histochemically demonstrated in the Mauthner cells of the teleost fish Xiphophorus helleri. This is the first detection of the enzyme in these giant neurons (which are restricted to fishes and amphibians) of a gnathostomate vertebrate. NADPHDH reactivity in fixed tissue is thought to reflect the activity of nitric oxide synthase.