The exercises are described here.

1:
[ 1BD0 | 1PTM | 2SBL | 2FCR ]

2:
[ 1SBP | 1POT ]

3:
VTMYKLVIKGNNVKGETTTKALDAQTAEQVFKEYRNDKGVWTFDDSDDQYQVME
STSYNYIFGARNIKGHTSMACVGADTGFNIFIGVENGNNKWMHPHAYVVYQVVL
VRHCQGVFSNIELKKTQPSPAPIIEWEWLGYNTQRQHGIEREFDPHAMWMVLKV

4:
RTLCGGQLVDAMQFICGDRGFYFNRSTDYGMSTGILDHCQFRGCDMRNLTMYCPPLAGSSGSSGSGEKPFQCEECGKRFTQN
SHLHSHQRVHTGEKPSGPSSGLTPAITTYKLVINGKSLRGQTTTKAVDSDTSTKCFCQYCNDRGVDGVWTYDDATSTYTSTE