Fig. 1.

Continuous growth of publications with immunohistochemical applications of PSSAs. A Google Scholar Advanced search (full text search) using the Boolean search: {(“phosphospecific” OR “phospho-specific” OR “phosphorylation-specific” OR “phosphorylation state-specific”) AND “immunohistochemistry”} revealed a continuous increase in the annual number of publications including these key phrases in the full text content. The apparent slight decline in 2007 is likely due to the restricted full text access of many journals in the first year after publication