Figure 4. Concentrations of MUC5B and MUC7 during the first year of infancy. Median concentrations of MUC5B (circles) and MUC7 (triangles) from nine infants were determined by ELISA after each month of age. Error bars indicate the 25% and 75% quantiles. Curves for MUC5B (solid line, r² = 0.95) and MUC7 (dotted line, r² = 0.86) were deduced by regression analysis of median concentrations vs. age. Arrows indicate first tooth emergence of each respective infant.