document.write('<span style= "color: red; font-weight: bold">Recommended reading:</span>');
document.write(' &nbsp;  &nbsp; <a href = "http://www.horizonpress.com/molbiobooks">Molecular Biology</a>');
document.write(' &nbsp; | &nbsp; <a href = "http://www.horizonpress.com/pcrbooks">PCR</a>');
document.write(' &nbsp; | &nbsp; <a href = "http://www.horizonpress.com/genomicsbooks">Genomics</a>');
document.write(' &nbsp; | &nbsp; <a href = "http://www.horizonpress.com/epigeneticsbooks">Epigenetics</a>');
document.write(' &nbsp; | &nbsp; <a href = "http://www.horizonpress.com/epigeneticsbooks">Non-coding RNAs</a>');