Hemichordate Receptors

Cross references:   Receptors in General    Hemichordates   
Hemichordate Genomics   Hemichordate Hormones   
Hemichordate Nerves       Hemichordate Neurotransmitters          

What happened to the text?  Did I goof up and erase it? 

When I looked under 'Page History', I didn't find any text.  So maybe it's just a place holder with text to come.