Table 1. Top two and bottom two titles in the amount of topic overlap, as determined by cos product.

Title	cos product
In vitro properties of the first ORF protein from mouse LINE-1 support its role in ribonucleoprotein particle formation during retrotransposition	0.664
Prospero is a panneural transcription factor that modulates homeodomain protein activity	0.656
Chondrocytes as a specific target of ectopic Fos expression in early development	0.492
c-Myc transactivation of LDH-A: Implications for tumor metabolism and growth	0.490