Proposed commercial application:Software development of an ApEn program for application to general endocrine hormone secretion time-series; incorporation of ApEn software into existing hormonal administration systems. Collaborations with pharmaceutical companies who manufacture infertility drugs such as clomiphene citrate (e.g., Clomid, Merrill Dow, or Serophene, Serono Laboratories). Subsequently, collaborations with pharmaceuticals regarding menopause-related drugs.National Institute of Human Development (NIHD)