Why doesn't nicotinic ACh receptor immunoreactivity knock out?

Immunochemical analyses of protein expression and localization rely on the specificity of primary immunoreagents. A recent report, using transgenic mice, casts doubt on the specificity of three antibodies commonly used to immunolocalize alpha 7 nicotinic ACh receptors. These data highlight the conundrum facing histologists - how 'real' is the labelling they see?