Table 3.

Physiological Systems Significantly Enriched in Term Amniotic Fluid Cell-Free Fetal RNA

Category	Number of Genes
Immune cell trafficking	72
Digestive system development and function	51
Hematopoiesis	23
Cardiovascular system development and function	39
Hematological system development and function	23
Tissue development	72
Hair and skin development and function	23
Embryonic development	7
Organismal development	87
Renal and urological system development and function	35
Organ morphology	34
Reproductive system development and function	43
Connective tissue development and function	26
Skeletal and muscular system development and function	56
Nervous system development and function	24
Tissue morphology	112
Lymphoid tissue structure and development	20
Respiratory system development and function	16

Listed in descending order of statistical significance. Detailed results are provided in Appendix 4, available online at http://links.lww.com/xxx.