WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the
semi-annual report dated September 30, 2000 and is qualified in its
entirety by reference to such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 311
<NAME> U.S. GOVERNMENT SECTOR PORTFOL-INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2001
<PERIOD-END> SEP-30-2000
<INVESTMENTS-AT-COST> 1183062
<INVESTMENTS-AT-VALUE> 1188657
<RECEIVABLES> 112918
<ASSETS-OTHER> 1519
<OTHER-ITEMS-ASSETS> 9810
<TOTAL-ASSETS> 1312904
<PAYABLE-FOR-SECURITIES> 576753
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 782
<TOTAL-LIABILITIES> 577535
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 702557
<SHARES-COMMON-STOCK> 67133
<SHARES-COMMON-PRIOR> 29355
<ACCUMULATED-NII-CURRENT> 5160
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 21154
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 6498
<NET-ASSETS> 735369
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 19026
<OTHER-INCOME> 0
<EXPENSES-NET> 145
<NET-INVESTMENT-INCOME> 18881
<REALIZED-GAINS-CURRENT> 17886
<APPREC-INCREASE-CURRENT> (613)
<NET-CHANGE-FROM-OPS> 0
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 17873
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 57107
<NUMBER-OF-SHARES-REDEEMED> 20906
<SHARES-REINVESTED> 1577
<ISSUED-IN-REORGANIZATION> 0
<FUND-REIMBURSEMENT-FEE> 0
<NET-CHANGE-IN-ASSETS> 423717
<ACCUMULATED-NII-PRIOR> 4152
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 3268
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 58
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 144
<AVERAGE-NET-ASSETS> 577111
<PER-SHARE-NAV-BEGIN> 10.62
<PER-SHARE-NII> 0.35
<PER-SHARE-GAIN-APPREC> 0.26
<PER-SHARE-DIVIDEND> (0.28)
<PER-SHARE-DISTRIBUTIONS> 0.00
<PER-SHARE-FUND-REIMBURSEMENT-FEE> 0.00
<PER-SHARE-NAV-END> 10.95
<EXPENSE-RATIO> 0.05
</TABLE>
