Synaptonemal complex in the XY pair of Akodon azarae.

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Abstract
Three-dimensional reconstructions of the XY chromosomal pair in spermatocytes of A. azarae show that the ultrastructural axes of the X and Y chromosomes pair partially to form a long synaptonemal complex. The differential (unpaired) region of the X axis shows an unusually long and permanent splitting into 2 elements, which form an anomalous synaptonemal complex. The chromatin of the XY body is less closely packed than the autosomal chromatin during all synaptic stages. The length ratio of the X and Y axes differs from the length ratio recorded for normal, somatic X and Y chromosomes.