Living Microsystems, a Watertown, Mass., developer of new prenatal diagnostics, raised $19.6 million in a second funding round, VentureWire reports (subscription required). The company is developing new blood tests designed to detect prenatal chromosomal and genetic defects that could complement or even one day replace amniocentesis and similar invasive tests.

The round was led by Alloy Ventures, joined by Mohr Davidow Ventures and angel funders. Living Microsystems had previously raised a total of $9 million in seed and angel funding, according to VentureWire.