Postpartum Teenagers' Views on Providing Contraception in School-Based Health Clinics.

Background: To determine characteristics of teen pregnancies in southeast Texas and the opinions of postpartum teenagers with regard to having contraceptive services available in high school clinics.

Methods: A cross-sectional study of postpartum teenagers interviewed during their hospital stay.

Results: Of 404 postpartum teenagers interviewed, 86% had unplanned pregnancies.

Single turnover kinetics of tryptophan hydroxylase: evidence for a new intermediate in the reaction of the aromatic amino acid hydroxylases.

Tryptophan hydroxylase (TrpH) uses a non-heme mononuclear iron center to catalyze the tetrahydropterin-dependent hydroxylation of tryptophan to 5-hydroxytryptophan. The reactions of the TrpH.Fe(II), TrpH.