Exhibit 21.1

Subsidiaries of Hologic	Jurisdiction of Incorporation or Organization
Hologic Hitec Imaging GmbH	Germany
BioLucent, LLC	Delaware
Cruiser, Inc.	Delaware
Hologic (Australia) Pty Ltd.	Australia
Hologic Canada Limited	Canada
Cytyc Cayman Limited	Cayman Islands
Cytyc Corporation	Delaware
Cytyc Development Company LLC	Delaware
Hologic Netherlands B.V.	Netherlands
Hologic Europe Middle East and Africa, S.A.	Switzerland
Hologic Switzerland SARL	France
Hologic Deutschland, GmbH	Germany
Hologic Asia Pacific Limited	Hong Kong
Hologic Iberia, S.L.	Spain
Cytyc Interim, Inc.	Delaware
Cytyc International, Inc.	Delaware
Hologic Italia S.r.l.	Italy
Cytyc Limited Liability Company	Delaware
Cytyc Prenatal Products Corp.	Delaware
Cytyc Securities Corporation	Massachusetts
Hologic Suisse SA	Switzerland
Cytyc Surgical Products II, Limited Partnership.	Massachusetts
Cytyc Surgical Products III, LLC	Delaware
Cytyc Surgical Products Limited Partnership	Massachusetts
Direct Radiography Corp.	Delaware
Hologic Asia Limited	Hong Kong
Hologic España S.A.	Spain
Hologic N.V.	Belgium
Hologic France SA	France
Hologic International Holdings B.V.	Netherlands
Hologic Investment Corp.	Massachusetts
Hologic Limited Partnership	Massachusetts
Hologic Surgical Products Costa Rica S.A.	Costa Rica
Hologic (UK) Limited	England and Wales
Interlace Medical, Inc.	Delaware
R2 Technology Canada, Inc.	Canada
SST Merger Corp.	Delaware
Sentinelle Medical Inc.	Canada
Sentinelle Medical USA Inc.	Nevada
Suros Surgical Systems, Inc.	Delaware

Subsidiaries of Hologic	Jurisdiction of Incorporation or Organization
Third Wave Technologies, Inc.	Delaware
Third Wave Agbio Inc.	Delaware
Hologic Japan, Inc.	Japan
Navigation Three Limited	Hong Kong
TCT International Co., Ltd.	British Virgin Islands
Beijing Century Aikang Technology Co., Ltd.	China
TCT Medical (Beijing) Clinical Test Institute	China
Huaxia Likang (Beijing) Technology Co., Ltd.	China
Hangzhou Zuanbai Technology Co., Ltd	China
Hologic TCT Technologies Co., Ltd.	China
Mingwood Biotechnology Co., Ltd.	China
Century Likang (Beijing) Co., Ltd.	China
Beijing TCT Medical Technology Co., Ltd.	China
Jiangsu Kang Ke Medical Devices Co., Ltd.	China
Zheng Zhou Yong Run Medical Devices Co., Ltd.	China
Beijing Healthcome Technology Co., Ltd.	China
Hologic (China) Enterprise Management Consulting Co., Ltd.	China
Gen-Probe Incorporated	Delaware
Gen-Probe GTI Diagnostics Holding Company	Delaware
Gen-Probe Holdings, Inc.	Delaware
Gen-Probe International, Inc.	Delaware
Gen-Probe Prodesse, Inc.	Wisconsin
Gen-Probe Sales & Service, Inc.	Delaware
Gen-Probe Australia Pty Limited	Australia
Gen-Probe Czech Republic s.r.o.	Czech Republic
Gen-Probe Denmark ApS	Denmark
Gen-Probe Deutschland GmbH	Germany
Gen-Probe France SAS	France
Gen-Probe Italia S.r.l.	Italy
Gen-Probe Life Sciences Ltd.	United Kingdom
Gen-Probe Netherlands B.V.	Netherlands
Gen-Probe Sweden AB	Sweden
Gen-Probe UK Limited	United Kingdom
Gen-Probe GTI Diagnostics, Inc.	Wisconsin
Gen-Probe Transplant Diagnostics, Inc.	Delaware
Food DNA Services Limited	United Kingdom
Tepnel Biosystems Limited	United Kingdom
Tepnel Diagnostics Limited	United Kingdom
Tepnel Medical Limited	United Kingdom
Tepnel Scientific Services Limited	United Kingdom
Wildlife DNA Services Limited	United Kingdom
Molecular Light Technology Limited	United Kingdom
GTI Diagnostics GmbH	Germany
Gen-Probe GTI Diagnostics K.K.	Japan
Gen-Probe Belgium BVBA	Belgium
Bioanalysis Limited	United Kingdom
Gen-Probe Cardiff Ltd.	United Kingdom