LETTERS TO NATURE allowing for the van der Waals radii of the attached hydrogens, the `free space' dimension of the channel in this direction (left to right in Fig. 2A) is close to 20 A.

CORNINGHazleton MUTAGENICITY TEST ON T-6342 IN AN IN VIVO MOUSE MICRONUCLEUS ASSAY FINAL REPORT AUTHOR HemalathaMurli,Ph.D.

CorporatOeccupationMaeldicine 3M CenterB,uildin2g20-3W-05 St.PaulN,lN55144-1000 651'3/'j4230Telephone 6517339066Fax 6.

MICROBICS MICROTOX@ TOXICITY TEST TEST SUBSTANCE Identity:A mixturecontainingperfluorooctanesulfonatweh,ich may also be referredtoas PFOS, FC-95, or as a component of FC-603EF. (1Octanesulfoniaccid)(CAS # 2795-39-3).

Corporate Health Physics Corporate Occupational Medicine Corporate Product Responsibility Corporate Toxicology 3M Medical Department 3M Center, 220-2E-02 PO Box 33220 St.

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AAA6-0679 MULTI-CITY STUDY FINAL FIELD REPORT FOR COLUMBUS GEORGIA AND PORT ST.

3M REPORT: BIOACCUMUIATION STUDIES -O200- b i t March 8, 1993 UA6-0370 Ca> -p .

PFOS: A DIETARY LC50 STUDY WITH THE NORTHERN BOBWHITE WILDLIFE INTERNATIONAL LTD.

AR226-2466 "Roger J.

AR226-3189 DuPont-7326 TRADE SECRET Study Title H-25006: Bacterial Reverse M utation T est w ith an Independent Repeat Assay Testing G uideline OECD G uidelines for Testing o f Chemicals Section 4: H ealth Effects, No. 471 (1998); OPPTS G uideline 870.5100 A u th o rs Valentine O.

AR226-3371 (STOP DuPont Central Research and Development April 21, 1994 OuPom Centrai Research and Development Haskell Laboratory far Toxicology and Industrial Medicine P.Q.

AR226-3641 3M ENVIRONMENTAL LABORATORY REPORT NO.

3 Environmental Laboratory E05-0210 Interim Report#15 Interim Report #15: Analysis of Water Samples from Northern Alabama Potable Water Systems Study Title Analysis of Perfluorobutanesulfonate (PFBS), Perfluorohexanesulfonate (PFHS), and Perfluorooctanesulfonate (PFOS) in Water, Soil, Sediment, Fish, Clams, Vegetation, Small Mammal Liver and Small Mammal Serum Using LC/MS/MS for the 3M Decatur Monitoring Program Data Requirement EPA TSCA Good Laboratory Practice Standards 40 CFR 792 Author Michelle D.

AR 226 - 087/ MICROBICS MICROTOX TOXICITY TEST TESTSUBSTANCE Identity: rMeifxetrurreed ctoonatasinPiFnOgSp,erFfCl-u9o5r,ooocrtaansesaulcfoomnpaotenewnhticohf mFCa-y30a1l7so.