g solution: 335 g NBT [stock solution: 75 mg/ml in 70 % dimethylformamide], 174 g BCIP [stock solution: 50 mg/ml in 100% dimethylformamide], and 240 g Levamisole per ml buffer 3). The staining solution was removed by rinsing in 5x TE, the staining procedure was stopped by incubating the slides for 15 minutes in 5x TE. The sections were briefly rinsed in distilled water, then counterstained with methylene green. The sections were mounted with Kaisers glycerin-gelatin. If immunofluorescence protocols are used in combination with in situ hybridization, we recommend development with the ELF substrate (ELF Kit, Molecular Probes).

• Fluorochrome-conjugated antibodies

When the mRNA of interest is abundantly expressed, anti-DIG antibodies conjugated with FITC or other fluorochromes can be used. The slides were incubated for 2 hours with FITC-conjugated anti-DIG antibody (1:201:200 in buffer 1), then washed twice for 5 minutes with buffer 2 (Buffer 1 containing 0.05% Tween). The sections were counterstained with Hoechst Dye 33342 and mounted with fluorescence mounting medium (DAKO).

Immunohistochemistry

Usually immunohistochemistry was performed immediately after in situ hybridization. However, with both detection procedures excellent results were also obtained for several weeks (up to months) after in situ hybridization. All washing steps were performed on a shaking platform.

• The peroxidase staining procedure was performed according to the manufacturers recommendations (Vectastain Elite Kit, Vector Laboratories).

• Immunofluorescence: The slides were incubated with PBS/12% BSA for 12 hours in a humidified chamber, then the blocking solution was removed. The slides were incubated with an appr
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