NL25 NFD against heavy action from two others

[KAT21]

No reads

Poker Stars - No Limit Hold'em Cash Game - $0.10/$0.25 Blinds - 8 Players - (LegoPoker HH Converter)

Hero (SB): $26.40
BB: $11.25
UTG: $25.00
UTG+1: $27.05
MP1: $15.65
MP2: $23.80
CO: $28.95
BTN: $25.00

Preflop: Hero is dealt A[img]/images/graemlins/diamond.gif[/img] T[img]/images/graemlins/diamond.gif[/img] (8 Players)
UTG folds, UTG+1 calls $0.25, MP1 calls $0.25, 3 folds, Hero calls $0.15, <font color="red">BB raises to $1.00</font>, UTG+1 calls $0.75, MP1 calls $0.75, Hero calls $0.75

Flop: ($4) 5[img]/images/graemlins/spade.gif[/img] J[img]/images/graemlins/diamond.gif[/img] 4[img]/images/graemlins/diamond.gif[/img] (4 Players)
Hero checks, <font color="red">BB bets $1.00</font>, <font color="red">UTG+1 raises to $3.25</font>, <font color="red">MP1 raises to $6.00</font>, Hero ???