Chromosome painting probes specific for macrochromosomes 1,2,3,4,5 and Z were
applied to both mitotic and lampbrush chromosomes of the chicken (Gallus gallus
domesticus). Five autosomal macrobivalents and sex chromosome Z in the lampbrush
phaze were identified and their correspondence to the target chromosomes in the metaphaze
of mitosis was shown. Nascent transcripts on lateral loops of the target lampbrush
chromosome were intensively labelled when the hybridization was performed without RNase
A treatment according to the DNA/(DNA+RNA) hybridization protocol.