The macronucleus, one micronucleus, and the cytoplasm of Conchophthirus. The negative magnification is 6,800X. The raw film was scanned with an Epson Perfection V750 Pro. This image is best used for q...

A high resolution image of the micronucleus and macronucleus of Opercularia coarctata. The nuclear envelope has numerous pores, at least as many per unit length as in the macronucleus. Some areas of t...

This group represents a serial series of sections. At the level of this section, the macronucleus and micronucleus are present. The buccal cavity with cilia and the spongiome of CV, membranelles of pe...

This group represents a serial series of sections. At the level of this section, the macronucleus and micronucleus are present. In the buccal cavity a row of paroral cilia is seen to separate the bucc...

Transmission electron micrographs showing chromosomes in dividing spermatogonia during metaphase in tissue from ram testis (upper panel) and as they begin to separate during early anaphase in tissue f...

Transmission electron micrograph showing part of a decondensed mitotic chromosome. The residual protein 'scaffold' (at bottom) is surrounded by a 'halo' of DNA loops 20 to 24 micrometers long. The en...

Avian erythrocytes differ from most vertebrates in retaining the nucleus at maturity. During erythrocyte development, transcription is progressively shut down and nuclei become compact and heterochrom...

Time lapse movie of mitosis in Xenopus laevis tissue culture cell. The sequence illustrates the requirement for all chromosomes to be aligned on the metaphase plate before anaphase is initiated.

Transmission electron micrograph of section through the macronucleus of Nassula sp containing many darkly staining nucleoli.

High resolution image of the nucleoli of the macronucleus. Nucleoli have a core of DNA that contains the genes that are transcribed into ribosomal RNA. Assembly of the ribosomal subunits from this pro...