4-1	Three New Species of the Wood Roach, Cryptocercus (Blattodea: Cryptocercidae), From the Eastern United States. Craig A. Burnside, Paul T. Smith and Srini Kambhampati On-line date: February 25, 1999 Erratum added February 4, 2000 http://epress.com/w3jbio/vol4/burnside/index.html
4-2	Frequency Tuning on Red Noise Driven Stochastic Resonance: Implications to the evolution of sensory systems. Flávio C. Coelho and Claudia T. Codeço On-line date: February 25, 1999 http://epress.com/w3jbio/vol4/coelho/index.html
4-3	mRNA Classification Based on Calculated Folding Free Energies William Seffens Ph.D. On-line date: February 25, 1999 http://epress.com/w3jbio/vol4/seffens/index.html
4-4	Monte Carlo Probabilities of Cluster Formation by Image Noise. Jerry J. Sychra, Michael J. Blend, Noam Alperin, and Steven U. Brint On-line date: April 7, 1999 http://epress.com/w3jbio/vol4/sychra/index.html
4-5	Isolated populations of Chorthippus parallelus erythropus (Orthopera: Acrididae); a divergence evolution from populations in contact with the Chorthippus parallelus hybrid zone. Jose M. Rubio On-line date: October 28, 1999 http://epress.com/w3jbio/vol4/rubio/index.html
4-6	Adaptation to Lysozyme Does Not Occur Via Receptor-Mediated Endocytosis in Tetrahymena thermophila Joseph M. Cantor, Stephanie R. Mace, Coriann M. Kooy, Brian D. Caldwell, and Heather G. Kuruvilla On-line date: October 28, 1999 http://epress.com/w3jbio/vol4/cantor/index.html
4-7	Detection of Gene Expression Patterns in Various Plant Tissues Using Non-Radioactive mRNA in situ Hybridization Guoping Shu, David Baum, and Laurens Mets On-line date: December 8, 1999 http://epress.com/w3jbio/vol4/shu/index.html