In some embodiments, the spacer comprises or consists of SEQ ID NO: 30, the costimulatory domain comprises SEQ ID NO: 12 or variant thereof having at least 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or more sequence identity thereto, the transmembrane domain is of CD28 or comprises SEQ ID NO: 9 or a variant thereof having at least 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or more sequence identity thereto, the scFv contains the binding domain of or CDRs of or V.sub.H and V.sub.L of FMC63, the primary signaling domain contains SEQ ID NO: 13, 14, or 15, and/or a variant thereof having at least 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or more sequence identity thereto.
In some embodiments, the spacer comprises or consists of SEQ ID NO: 31, the costimulatory domain comprises SEQ ID NO: 12 or variant thereof having at least 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or more sequence identity thereto, the transmembrane domain is of CD28 or comprises SEQ ID NO: 9 or a variant thereof having at least 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or more sequence identity thereto, the scFv contains the binding domain of or CDRs of or V.sub.H and V.sub.L of FMC63, the primary signaling domain contains SEQ ID NO: 13, 14, or 15, and/or a variant thereof having at least 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or more sequence identity thereto.
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