Figure 1 | Chromosomal bouquets of different species.   a | Early drawing (1885) of a bouquet nucleus of Helix pomatia (reproduced from Ref. 63). b | Zygotene bouquet of Myxine glutinosa. Note the centrosome at the bouquet base (reproduced from Ref. 18). c | Bouquet arrangement during Coccid (intracellular parasite) prophase I (polarization involves only one telomere) . The large round sphere represents the nucleolus (reproduced from Ref. 21). d | Crowded early zygotene bouquet base in achiasmate meiosis of tetraploid Bombyx mori female (reproduced from Ref. 64, with permission from S. Rasmussen and P. Holm, The Carlsberg Laboratory). e | Late leptotene bouquet of a human spermatocyte. DNA is stained with DAPI (blue), axial cores by immunofluorescence with antibodies against SCP3 (yellow, false colour). The resemblance of the SCP3 staining and the chromosome structures depicted by the early cytologists (compare with a) suggests that these structures resemble axial elements or complete synaptonemal complexes. f | Projection of optical sections covering 5 m near the centre of a DAPI-stained (red, false coloured) three-dimensionally preserved maize bouquet nucleus after telomere fluorescence in situ hybridization (green signals). Telomeres are grouped at the lower left of this nucleus (reproduced with permission from Ref. 65 © (1997) The Rockefeller University Press).

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© 2001 Nature Publishing Group