>4weu_E mol:protein length:127 Anti-F4+ETEC bacteria VHH variable regionQVQLQESGGGLVQAGGSLRLSCAASGLTFDTYAMGWFRQAPGKKREYVAAISWTGISTYYADIAKGRFTISRDNAKNTLYLQMDSLKPEDTAVYYCAAQKSLNVPAPWDYWGQGTQVTVSSHHHHHH