Supplementary Materials

This PDF file includes:

• Fig. S1. PTB prevention for various doses of P4 with TSA.
• Fig. S2. PTB prevention for F127 vehicle control.
• Fig. S3. Histogram of litter sizes.
• Fig. S4. Individual litter pup viability.
• Fig. S5. Amniotic fluid endotoxin quantification.
• Fig. S6. TSA metabolite PK.
• Fig. S7. PK for 1 mg of P4 dosed alone.
• Fig. S8. AUC for PK studies.
• Fig. S9. Cervical gene expression.
• Fig. S10. PHM1-41 cell viability.
• Table S1. Formulation optimization for TSA NS.
• Table S2. Pup behavior fail rates.
• Table S3. Antibodies used in Western blotting.
• Table S4. Primer sequences.

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