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> 321
<NAME> MORTGAGE PORTFOLIO-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> 6990354
<INVESTMENTS-AT-VALUE> 7046317
<RECEIVABLES> 884130
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 39096
<TOTAL-ASSETS> 7969543
<PAYABLE-FOR-SECURITIES> 3984440
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 355907
<TOTAL-LIABILITIES> 4340347
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 3557464
<SHARES-COMMON-STOCK> 345653
<SHARES-COMMON-PRIOR> 96004
<ACCUMULATED-NII-CURRENT> 21397
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 10558
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 39777
<NET-ASSETS> 3629196
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 90303
<OTHER-INCOME> 0
<EXPENSES-NET> 4230
<NET-INVESTMENT-INCOME> 86073
<REALIZED-GAINS-CURRENT> 10375
<APPREC-INCREASE-CURRENT> 29386
<NET-CHANGE-FROM-OPS> 125834
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 68996
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 293821
<NUMBER-OF-SHARES-REDEEMED> 50302
<SHARES-REINVESTED> 6130
<ISSUED-IN-REORGANIZATION> 0
<FUND-REIMBURSEMENT-FEE> 0
<NET-CHANGE-IN-ASSETS> 2643633
<ACCUMULATED-NII-PRIOR> 4320
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 183
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 231
<INTEREST-EXPENSE> 3647
<GROSS-EXPENSE> 4224
<AVERAGE-NET-ASSETS> 2301707
<PER-SHARE-NAV-BEGIN> 10.26
<PER-SHARE-NII> 0.39
<PER-SHARE-GAIN-APPREC> 0.09
<PER-SHARE-DIVIDEND> (0.24)
<PER-SHARE-DISTRIBUTIONS> 0.00
<PER-SHARE-FUND-REIMBURSEMENT-FEE> 0.00
<PER-SHARE-NAV-END> 10.50
<EXPENSE-RATIO> 0.37
</TABLE>
